fix gcc-arm warning "suggest braces around empty body"

diff --git a/lib/compress/zstdmt_compress.c b/lib/compress/zstdmt_compress.c
index 24f5e5b8b4310b5b3a983f4568f01089d8febe66..6f467f6a5d44eecb19f445fd3f1b9d3453e68ad7 100644 (file)
--- a/lib/compress/zstdmt_compress.c
+++ b/lib/compress/zstdmt_compress.c
@@ -36,7 +36,7 @@ if (g_debugLevel>=MUTEX_WAIT_TIME_DLEVEL) { \
 
 #else
 
-#  define DEBUGLOG(l, ...)   /* disabled */
+#  define DEBUGLOG(l, ...)      {}    /* disabled */
 #  define PTHREAD_MUTEX_LOCK(m) pthread_mutex_lock(m)
 
 #endif