cros_sample_getcwd02: fix const warning

BUG=chromium:465038
TEST=building for x86 still works

Change-Id: Id1c49fc55e080b369a88456cfc1360ed40e8195f
Reviewed-on: https://chromium-review.googlesource.com/257521
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/testcases/cros/kernel/syscalls/cros_sample_getcwd/cros_sample_getcwd02.c b/testcases/cros/kernel/syscalls/cros_sample_getcwd/cros_sample_getcwd02.c
index 0d941b8..8719dc0 100644
--- a/testcases/cros/kernel/syscalls/cros_sample_getcwd/cros_sample_getcwd02.c
+++ b/testcases/cros/kernel/syscalls/cros_sample_getcwd/cros_sample_getcwd02.c
@@ -88,8 +88,8 @@
 {
 	FILE *fin;
 	char *cp;
-	int lc;			 /* loop counter */
-	char *msg;		/* parse_opts() return message */
+	int lc;			/* loop counter */
+	const char *msg;	/* parse_opts() return message */
 
 	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) {
 		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);