use explicit size of kErrorMessages[] arrays

Change-Id: If02864e3a07ae37814bf379bf347862cd2871bf4
diff --git a/examples/example_util.c b/examples/example_util.c
index ecede97..b77b816 100644
--- a/examples/example_util.c
+++ b/examples/example_util.c
@@ -113,7 +113,7 @@
 //------------------------------------------------------------------------------
 // WebP decoding
 
-static const char* const kStatusMessages[] = {
+static const char* const kStatusMessages[VP8_STATUS_NOT_ENOUGH_DATA + 1] = {
   "OK", "OUT_OF_MEMORY", "INVALID_PARAM", "BITSTREAM_ERROR",
   "UNSUPPORTED_FEATURE", "SUSPENDED", "USER_ABORT", "NOT_ENOUGH_DATA"
 };