Don't force everybody to call setup_ident().

Back when only handful commands that created commit and tag were
the only users of committer identity information, it made sense
to explicitly call setup_ident() to pre-fill the default value
from the gecos information.  But it is much simpler for programs
to make the call automatic when get_ident() is called these days,
since many more programs want to use the information when updating
the reflog.

Signed-off-by: Junio C Hamano <junkio@cox.net>

receive-pack.c

@@ -429,7 +429,6 @@ int main(int argc, char **argv)
 	if (is_repository_shallow())
 		die("attempt to push into a shallow repository");
 
-	setup_ident();
 	git_config(receive_pack_config);
 
 	if (0 <= transfer_unpack_limit)