parse_object_buffer: don't ignore errors from the object specific parsing functions

In the case of an malformed object, the object specific parsing functions
would return an error, which is currently ignored. The object can be partial
initialized in this case.

This patch make parse_object_buffer propagate such errors.

Signed-off-by: Martin Koegler <mkoegler@auto.tuwien.ac.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

object.c

@@ -140,7 +140,8 @@ struct object *parse_object_buffer(const unsigned char *sha1, enum object_type t
 	if (type == OBJ_BLOB) {
 		struct blob *blob = lookup_blob(sha1);
 		if (blob) {
-			parse_blob_buffer(blob, buffer, size);
+			if (parse_blob_buffer(blob, buffer, size))
+				return NULL;
 			obj = &blob->object;
 		}
 	} else if (type == OBJ_TREE) {
@@ -148,14 +149,16 @@ struct object *parse_object_buffer(const unsigned char *sha1, enum object_type t
 		if (tree) {
 			obj = &tree->object;
 			if (!tree->object.parsed) {
-				parse_tree_buffer(tree, buffer, size);
+				if (parse_tree_buffer(tree, buffer, size))
+					return NULL;
 				eaten = 1;
 			}
 		}
 	} else if (type == OBJ_COMMIT) {
 		struct commit *commit = lookup_commit(sha1);
 		if (commit) {
-			parse_commit_buffer(commit, buffer, size);
+			if (parse_commit_buffer(commit, buffer, size))
+				return NULL;
 			if (!commit->buffer) {
 				commit->buffer = buffer;
 				eaten = 1;
@@ -165,7 +168,8 @@ struct object *parse_object_buffer(const unsigned char *sha1, enum object_type t
 	} else if (type == OBJ_TAG) {
 		struct tag *tag = lookup_tag(sha1);
 		if (tag) {
-			parse_tag_buffer(tag, buffer, size);
+			if (parse_tag_buffer(tag, buffer, size))
+			       return NULL;
 			obj = &tag->object;
 		}
 	} else {