stream_gribapi: fix ICC compiler warning

src/stream_gribapi.c

@@ -671,7 +671,7 @@ void grib2GetLevel(grib_handle *gh, int *leveltype, int *lbounds, int *level1, i
       status = grib_get_long(gh, "typeOfSecondFixedSurface", &lpar);
       if ( status == 0 ) leveltype2 = lpar;
 
-      if ( *leveltype == leveltype2 && leveltype != 255 ) *lbounds = 1;
+      if ( *leveltype == leveltype2 && *leveltype != 255 ) *lbounds = 1;
 
       if ( *lbounds == 0 )
 	{