mv: remove unneeded 'if (!show_only)'

Commit a127331c (mv: allow moving nested submodules,
2016-04-19), introduced

    if (show_only) continue;

in this for-loop before

    if (!show_only)

which became redundant, because it is now always true.

Signed-off-by: Stefan Moch <stefanmoch@mail.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/mv.c

@@ -287,8 +287,7 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 		pos = cache_name_pos(src, strlen(src));
 		assert(pos >= 0);
-		if (!show_only)
-			rename_cache_entry_at(pos, dst);
+		rename_cache_entry_at(pos, dst);
 	}
 	if (gitmodules_modified)