reset: rename update_refs to reset_refs

The function resets refs rather than doing arbitrary updates.
Rename it to allow a future general-purpose update_refs function
to be added.

Signed-off-by: Brad King <brad.king@kitware.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/reset.c b/builtin/reset.c
index afa6e02..789ee48 100644
--- a/builtin/reset.c
+++ b/builtin/reset.c
@@ -219,7 +219,7 @@
 	return argv[0] ? get_pathspec(prefix, argv) : NULL;
 }
 
-static int update_refs(const char *rev, const unsigned char *sha1)
+static int reset_refs(const char *rev, const unsigned char *sha1)
 {
 	int update_ref_status;
 	struct strbuf msg = STRBUF_INIT;
@@ -350,7 +350,7 @@
 	if (!pathspec && !unborn) {
 		/* Any resets without paths update HEAD to the head being
 		 * switched to, saving the previous head in ORIG_HEAD before. */
-		update_ref_status = update_refs(rev, sha1);
+		update_ref_status = reset_refs(rev, sha1);
 
 		if (reset_type == HARD && !update_ref_status && !quiet)
 			print_new_head_line(lookup_commit_reference(sha1));