Use consistent types for chunk_size and pos in storeBytes() and storeFile()

This makes storeBytes() consistent with storeFile(), which was recently changed for PHP-1505.

Author: jmikola

gridfs/gridfs.c

@@ -408,9 +408,8 @@ static void cleanup_stale_chunks(INTERNAL_FUNCTION_PARAMETERS, zval *cleanup_ids
 PHP_METHOD(MongoGridFS, storeBytes)
 {
 	char *bytes = 0;
-	int bytes_len = 0, chunk_num = 0, chunk_size = 0;
-	long global_chunk_size = 0;
-	pos = 0;
+	int bytes_len = 0, chunk_num = 0;
+	long global_chunk_size = 0, pos = 0;
 	int revert = 0;
 
 	zval temp;
@@ -467,7 +466,7 @@ PHP_METHOD(MongoGridFS, storeBytes)
 
 	/* insert chunks */
 	while (pos < bytes_len) {
-		chunk_size = bytes_len - pos >= global_chunk_size ? global_chunk_size : bytes_len - pos;
+		size_t chunk_size = bytes_len - pos >= global_chunk_size ? global_chunk_size : bytes_len - pos;
 
 		if (!(chunk_id = insert_chunk(chunks, zid, chunk_num, bytes + pos, chunk_size, options TSRMLS_CC))) {
 			revert = 1;