cbfs: Drop unnecessary cast in file_cbfs_fill_cache()

The results of malloc() are a void * and so this cast is unnecessary. Drop
it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/fs/cbfs/cbfs.c b/fs/cbfs/cbfs.c
index 443a148..415ea28 100644
--- a/fs/cbfs/cbfs.c
+++ b/fs/cbfs/cbfs.c
@@ -202,8 +202,7 @@
 		int used;
 		int ret;
 
-		node = (struct cbfs_cachenode *)
-				malloc(sizeof(struct cbfs_cachenode));
+		node = malloc(sizeof(struct cbfs_cachenode));
 		if (!node)
 			return -ENOMEM;
 		ret = file_cbfs_next_file(priv, start, size, align, node,