branch.c: delete size check of newly tracked branch names

Since commit 6f084a56 the length of a newly tracked branch name was limited
to 1019 = 1024 - 7 - 7 - 1 characters, a bound derived by having to store
this name in a char[1024] called key with two strings of length at most 7
and a '\0' character.

This was no longer necessary as of commit a9f2c136, which uses a strbuf
(documented in Documentation/technical/api-strbuf.txt) to store this value.

Remove this unneeded check to allow branch names longer than 1019
characters.

Signed-off-by: Jacopo Notarstefano <jacopo.notarstefano@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

branch.c

@@ -114,10 +114,6 @@ static int setup_tracking(const char *new_ref, const char *orig_ref,
 	struct tracking tracking;
 	int config_flags = quiet ? 0 : BRANCH_CONFIG_VERBOSE;
 
-	if (strlen(new_ref) > 1024 - 7 - 7 - 1)
-		return error(_("Tracking not set up: name too long: %s"),
-				new_ref);
-
 	memset(&tracking, 0, sizeof(tracking));
 	tracking.spec.dst = (char *)orig_ref;
 	if (for_each_remote(find_tracked_branch, &tracking))