[clang-tidy] Add additional test for cert-err33-c

Signed-off-by: Björn Svensson <[email protected]>

Author: bjosv

clang-tools-extra/test/clang-tidy/checkers/cert/err33-c.c

@@ -23,3 +23,14 @@ void test_wscanf_s(void) {
   // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should not be disregarded; neglecting it may lead to errors
   // CHECK-MESSAGES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning
 }
+
+int remove(const char *path);
+int removeNonStdLibFunc(const char *path);
+void test_remove(void) {
+  remove("123");
+  // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should not be disregarded; neglecting it may lead to errors
+  // CHECK-MESSAGES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning
+  removeNonStdLibFunc("123");
+  // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should not be disregarded; neglecting it may lead to errors
+  // CHECK-MESSAGES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning
+}