[PATCH 4/6] checkpolicy: silence -Wextra-semi-stmt warning

[Nicolas Iooss <nicolas.iooss@m4x.org>]

On Ubuntu 20.04, when building with clang -Werror -Wextra-semi-stmt
(which is not the default build configuration), the compiler reports:

      checkpolicy.c:740:33: error: empty expression statement has no
      effect; remove unnecessary ';' to silence this warning
      [-Werror,-Wextra-semi-stmt]
                      FGETS(ans, sizeof(ans), stdin);
                                                    ^

Introduce "do { } while (0)" blocks to silence such warnings.

Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
---
 checkpolicy/checkpolicy.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/checkpolicy/checkpolicy.c b/checkpolicy/checkpolicy.c
index acf1eac41559..8af31db5c6b7 100644
--- a/checkpolicy/checkpolicy.c
+++ b/checkpolicy/checkpolicy.c
@@ -119,11 +119,14 @@ static __attribute__((__noreturn__)) void usage(const char *progname)
 }
 
 #define FGETS(out, size, in) \
-if (fgets(out,size,in)==NULL) {	\
-		fprintf(stderr, "fgets failed at line %d: %s\n", __LINE__,\
-				strerror(errno)); \
-			exit(1);\
-}
+do { \
+	if (fgets(out,size,in)==NULL) {	\
+		fprintf(stderr, "fgets failed at line %d: %s\n", __LINE__, \
+			strerror(errno)); \
+		exit(1);\
+	} \
+} while (0)
+
 static int print_sid(sepol_security_id_t sid,
 		     context_struct_t * context
 		     __attribute__ ((unused)), void *data
-- 
2.32.0