format_variable_info(): fix wrong size test.

Coverity correctly discovered that when I switched "bufsz" and "sz" to
make "bufsz" be the one that was the size of "buf", I missed one of the
conditionals using it.

Signed-off-by: Peter Jones <pjones@redhat.com>

Author: vathpela

mok.c

@@ -167,7 +167,7 @@ format_variable_info(UINT8 *buf, size_t bufsz,
 		dprint(L"EFI %d.%d; no RT->QueryVariableInfo() %a\n",
 		       EFI_MAJOR_VERSION(RT), EFI_MINOR_VERSION(RT),
 		       is_apple_firmware_vendor() ? "(Apple)" : "");
-		if (sz > 0)
+		if (bufsz > 0)
 			buf[0] = '\0';
 		return 0;
 	} else {