checkout: relocate --to's "no branch specified" check

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 707330499fad66a0bddbb5cf96ff0569e2fe3433..f8d81291b9913a769f79405720210aa4eaf6daee 100644 (file)
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -82,8 +82,9 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
                                enum object_type type;
                                unsigned long size;
                                char *buffer = read_sha1_file(sha1, &type, &size);
-                               if (memcmp(buffer, "object ", 7) ||
-                                   get_sha1_hex(buffer + 7, blob_sha1))
+                               const char *target;
+                               if (!skip_prefix(buffer, "object ", &target) ||
+                                   get_sha1_hex(target, blob_sha1))
                                        die("%s not a valid tag", sha1_to_hex(sha1));
                                free(buffer);
                        } else