Replace void* by grib_handle*.

src/gribapi.h

@@ -94,7 +94,7 @@ static inline int my_grib_set_string(grib_handle* h, const char* key, const char
 
 static inline void *gribHandleNew(int editionNumber)
 {
-  void *gh = (void *)grib_handle_new_from_samples(NULL, (editionNumber == 1) ? "GRIB1" : "GRIB2");
+  grib_handle *gh = grib_handle_new_from_samples(NULL, (editionNumber == 1) ? "GRIB1" : "GRIB2");
   if ( gh == NULL ) Error("grib_handle_new_from_samples failed!");
 
   if ( editionNumber > 1 ) GRIB_CHECK(my_grib_set_long(gh, "numberOfValues", 0L), 0);