reftable: wrap EXPECT macros in do/while

The `EXPECT` macros used by the reftable test framework are all using a
single `if` statement with the actual condition. This results in weird
syntax when using them in if/else statements like the following:

```
if (foo)
	EXPECT(foo == 2)
else
	EXPECT(bar == 2)
```

Note that there need not be a trailing semicolon. Furthermore, it is not
immediately obvious whether the else now belongs to the `if (foo)` or
whether it belongs to the expanded `if (foo == 2)` from the macro.

Fix this by wrapping the macros in a do/while loop.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

reftable/test_framework.h

@@ -12,32 +12,38 @@ license that can be found in the LICENSE file or at
 #include "system.h"
 #include "reftable-error.h"
 
-#define EXPECT_ERR(c)                                                  \
-	if (c != 0) {                                                  \
-		fflush(stderr);                                        \
-		fflush(stdout);                                        \
-		fprintf(stderr, "%s: %d: error == %d (%s), want 0\n",  \
-			__FILE__, __LINE__, c, reftable_error_str(c)); \
-		abort();                                               \
-	}
-
-#define EXPECT_STREQ(a, b)                                               \
-	if (strcmp(a, b)) {                                              \
-		fflush(stderr);                                          \
-		fflush(stdout);                                          \
-		fprintf(stderr, "%s:%d: %s (%s) != %s (%s)\n", __FILE__, \
-			__LINE__, #a, a, #b, b);                         \
-		abort();                                                 \
-	}
-
-#define EXPECT(c)                                                          \
-	if (!(c)) {                                                        \
-		fflush(stderr);                                            \
-		fflush(stdout);                                            \
-		fprintf(stderr, "%s: %d: failed assertion %s\n", __FILE__, \
-			__LINE__, #c);                                     \
-		abort();                                                   \
-	}
+#define EXPECT_ERR(c)                                                          \
+	do {                                                                   \
+		if (c != 0) {                                                  \
+			fflush(stderr);                                        \
+			fflush(stdout);                                        \
+			fprintf(stderr, "%s: %d: error == %d (%s), want 0\n",  \
+				__FILE__, __LINE__, c, reftable_error_str(c)); \
+			abort();                                               \
+		}                                                              \
+	} while (0)
+
+#define EXPECT_STREQ(a, b)                                                       \
+	do {                                                                     \
+		if (strcmp(a, b)) {                                              \
+			fflush(stderr);                                          \
+			fflush(stdout);                                          \
+			fprintf(stderr, "%s:%d: %s (%s) != %s (%s)\n", __FILE__, \
+				__LINE__, #a, a, #b, b);                         \
+			abort();                                                 \
+		}                                                                \
+	} while (0)
+
+#define EXPECT(c)                                                                  \
+	do {                                                                       \
+		if (!(c)) {                                                        \
+			fflush(stderr);                                            \
+			fflush(stdout);                                            \
+			fprintf(stderr, "%s: %d: failed assertion %s\n", __FILE__, \
+				__LINE__, #c);                                     \
+			abort();                                                   \
+		}                                                                  \
+	} while (0)
 
 #define RUN_TEST(f)                          \
 	fprintf(stderr, "running %s\n", #f); \