credential-store: don't pass strerror to die_errno()

Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

credential-store.c

@@ -64,8 +64,7 @@ static void rewrite_credential_file(const char *fn, struct credential *c,
 		print_line(extra);
 	parse_credential_file(fn, c, NULL, print_line);
 	if (commit_lock_file(&credential_lock) < 0)
-		die_errno("unable to write credential store: %s",
-			  strerror(errno));
+		die_errno("unable to write credential store");
 }
 
 static void store_credential_file(const char *fn, struct credential *c)