checkpolicy: avoid potential use of uninitialized variable

    checkpolicy.c: In function ‘main’:
    checkpolicy.c:1000:25: error: ‘tsid’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
     1000 |                         printf("if_sid %d default_msg_sid %d\n", ssid, tsid);
          |                         ^

    checkpolicy.c: In function ‘main’:
    checkpolicy.c:971:25: error: ‘tsid’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
      971 |                         printf("fs_sid %d default_file_sid %d\n", ssid, tsid);
          |                         ^

Found by GCC 11 with LTO enabled.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>

checkpolicy/checkpolicy.c

@@ -970,8 +970,12 @@ int main(int argc, char **argv)
 			printf("fs kdevname?  ");
 			FGETS(ans, sizeof(ans), stdin);
 			ans[strlen(ans) - 1] = 0;
-			sepol_fs_sid(ans, &ssid, &tsid);
-			printf("fs_sid %d default_file_sid %d\n", ssid, tsid);
+			ret = sepol_fs_sid(ans, &ssid, &tsid);
+			if (ret) {
+				printf("unknown fs kdevname\n");
+			} else {
+				printf("fs_sid %d default_file_sid %d\n", ssid, tsid);
+			}
 			break;
 		case '9':
 			printf("protocol?  ");
@@ -999,8 +1003,12 @@ int main(int argc, char **argv)
 			printf("netif name?  ");
 			FGETS(ans, sizeof(ans), stdin);
 			ans[strlen(ans) - 1] = 0;
-			sepol_netif_sid(ans, &ssid, &tsid);
-			printf("if_sid %d default_msg_sid %d\n", ssid, tsid);
+			ret = sepol_netif_sid(ans, &ssid, &tsid);
+			if (ret) {
+				printf("unknown name\n");
+			} else {
+				printf("if_sid %d default_msg_sid %d\n", ssid, tsid);
+			}
 			break;
 		case 'b':{
 				char *p;