Allow abbreviations in the first refspec to be merged

The config item for a refspec side and the ref name that it matches
aren't necessarily character-for-character identical. We actually want
to merge a ref by default if: there is no per-branch config, it is the
found result of looking for the match for the first refspec, and the
first refspec is not a pattern. Beyond that, anything that
get_fetch_map() thinks matches is fine.
Signed-off-by: NDaniel Barkalow <barkalow@iabervon.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin-fetch.c

@@ -102,7 +102,7 @@ static struct ref *get_ref_map(struct transport *transport,
 				    remote->fetch[i].dst[0])
 					*autotags = 1;
 				if (!i && !has_merge && ref_map &&
-				    !strcmp(remote->fetch[0].src, ref_map->name))
+				    !remote->fetch[0].pattern)
 					ref_map->merge = 1;
 			}
 			if (has_merge)