fsx: Fix -Wformat-security warnings

Some distros (NixOS) have their build environment enable
-Werror=format-security by default for security/hardening reasons.
Currently fsx fails to build due to this:

fsx.c: In function 'prt':
fsx.c:215:18: error: format not a string literal and no format arguments [-Werror=format-security]
  fprintf(stdout, buffer);
                  ^
fsx.c:217:20: error: format not a string literal and no format arguments [-Werror=format-security]
   fprintf(fsxlogf, buffer);
                    ^
Indeed the compiler is correct here, if the message-to-be-printed were
to contain a '%', unpredictable things would happen. Fix this.

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

ltp/fsx.c

@@ -211,9 +211,9 @@ prt(const char *fmt, ...)
 	va_start(args, fmt);
 	vsnprintf(buffer, BUF_SIZE, fmt, args);
 	va_end(args);
-	fprintf(stdout, buffer);
+	fprintf(stdout, "%s", buffer);
 	if (fsxlogf)
-		fprintf(fsxlogf, buffer);
+		fprintf(fsxlogf, "%s", buffer);
 }
 
 void