Fix code warning.

Change-Id: Ib11fb49f528d3688351ae349d5b4e307c28b3967
diff --git a/mbtk/libmbtk_lib/common/mbtk_at.c b/mbtk/libmbtk_lib/common/mbtk_at.c
index 8721a52..8262756 100755
--- a/mbtk/libmbtk_lib/common/mbtk_at.c
+++ b/mbtk/libmbtk_lib/common/mbtk_at.c
@@ -15,12 +15,15 @@
 #include "mbtk_log.h"
 
 #define MBTK_AT_SOCK "/tmp/atcmd_at"
+
+#ifndef TEMP_FAILURE_RETRY
 #define TEMP_FAILURE_RETRY(exp) ({         \
     typeof (exp) _rc;                      \
     do {                                   \
         _rc = (exp);                       \
     } while (_rc == -1 && errno == EINTR); \
     _rc; })
+#endif
 
 static char *at_rsp_complete_tag[] = {
         "OK",