ps3-flash-util: Fix null access

Signed-off-by: Geoff Levand <geoff@infradead.org>
diff --git a/ps3-flash-util.c b/ps3-flash-util.c
index 8ae2af7..137366c 100644
--- a/ps3-flash-util.c
+++ b/ps3-flash-util.c
@@ -306,8 +306,8 @@
 	for (i = 0; i < required; i++) {
 		if (!argv[i + 1]) {
 			if (required > i) {
-				fprintf(stderr, "missing option: -%c at '%s'\n",
-					argv[0][1], argv[i + 1]);
+				fprintf(stderr, "missing option: -%c\n",
+					argv[0][1]);
 				return -1;
 			}
 			break;