Fix implicit conversion.

src/stream_gribapi.c

@@ -500,7 +500,7 @@ void gribapiAddRecord(stream_t * streamptr, int param, grib_handle *gh,
       grib_get_double(gh, "Latin1InDegrees", &lat_1);
       grib_get_double(gh, "Latin2InDegrees", &lat_2);
       grib_get_long(gh, "projectionCentreFlag", &projflag);
-      bool lsouth = gribbyte_get_bit(projflag, 1);
+      bool lsouth = gribbyte_get_bit((int)projflag, 1);
       if ( lsouth ) { lat_1 = -lat_1; lat_2 = -lat_2; }
 
       double lat_0 = lat_2;