rm: do not set a variable twice without intermediate reading.

Just the next line assigns a non-null value to seen.

Signed-off-by: Stefan Beller <stefanbeller@googlemail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/rm.c

@@ -316,7 +316,6 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
 	parse_pathspec(&pathspec, 0, PATHSPEC_PREFER_CWD, prefix, argv);
 	refresh_index(&the_index, REFRESH_QUIET, &pathspec, NULL, NULL);
 
-	seen = NULL;
 	seen = xcalloc(pathspec.nr, 1);
 
 	for (i = 0; i < active_nr; i++) {