ANDROID: Incremental fs: Fix two typos

Test: incfs_test passes
Bug: 151240628
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: I627e683b562329fd57aedc8393e22449ff09ee1f
(cherry picked from commit 06c715e275dc65e720759cfeacb4120289e2a306)

fs/incfs/data_mgmt.c

@@ -797,7 +797,7 @@ static int process_file_signature_md(struct incfs_file_signature *sg,
 	int error = 0;
 	struct incfs_df_signature *signature =
 		kzalloc(sizeof(*signature), GFP_NOFS);
-	void *buf = 0;
+	void *buf = NULL;
 	ssize_t read;
 
 	if (!df || !df->df_backing_file_context ||

fs/incfs/integrity.c

@@ -57,7 +57,7 @@ struct signature_info {
 	struct mem_range root_hash;
 };
 
-static u32 read_u32(u8 **p, u8 *top, u32 *result)
+static bool read_u32(u8 **p, u8 *top, u32 *result)
 {
 	if (*p + sizeof(u32) > top)
 		return false;