git rm: refresh index before up-to-date check

Since "git rm" is supposed to be porcelain, we should convince it to
be user friendly by refreshing the index itself.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

builtin-rm.c

@@ -137,6 +137,7 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
 
 	if (read_cache() < 0)
 		die("index file corrupt");
+	refresh_cache(REFRESH_QUIET);
 
 	pathspec = get_pathspec(prefix, argv);
 	seen = NULL;