data_call: fix codec error

Change-Id: I600928fcf43e1f9f1c9d98e3a385537d2e6b9152
diff --git a/mbtk/libmbtk_gnss/mbtk_gnss_5311.c b/mbtk/libmbtk_gnss/mbtk_gnss_5311.c
index 2a5540a..64d1fdc 100755
--- a/mbtk/libmbtk_gnss/mbtk_gnss_5311.c
+++ b/mbtk/libmbtk_gnss/mbtk_gnss_5311.c
@@ -611,13 +611,14 @@
         return MBTK_GNSS_RESULT_FAIL;
     }
 
+#ifndef MBTK_SG_SUPPORT
     ret = mbtk_gnss_nmea_thread_init();
     if(ret != 0)
     {
         LOGE("[mbtk_gnss_api] mbtk_gnss_nmea_thread_init fail.");
         return MBTK_GNSS_RESULT_FAIL;
     }
-
+#endif
     return MBTK_GNSS_RESULT_SUCCESS;
 }