xbps-pkgdb: check rval correctly for xbps_remove_pkg_from_file().

--HG--
extra : convert_revision : ae3f35ef7d01c84c5249554cbb08c5bbc63f17c8

bin/xbps-pkgdb/main.c

@@ -159,7 +159,7 @@ main(int argc, char **argv)
 		if (rv == ENOENT) {
 			printf("=> ERROR: %s not registered in database.\n",
 			     argv[1]);
-		} else {
+		} else if (rv != 0) {
 			printf("=> ERROR: couldn't unregister %s "
 			    "from database (%s)\n", argv[1], strerror(rv));
 			exit(EXIT_FAILURE);