staging: erofs: Modify conditional checks

Fix coding style alignment issues detected by checkpatch.pl
Use ! for NULL test rather than explicitly comparing to NULL.
Signed-off-by: NBhagyashri P. Dighole <digholebhagyashri@gmail.com>
Reviewed-by: NGao Xiang <gaoxiang25@huawei.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/erofs/data.c

@@ -53,7 +53,7 @@ struct page *__erofs_get_meta_page(struct super_block *sb,
 
 repeat:
 	page = find_or_create_page(mapping, blkaddr, gfp);
-	if (unlikely(page == NULL)) {
+	if (unlikely(!page)) {
 		DBG_BUGON(nofail);
 		return ERR_PTR(-ENOMEM);
 	}
@@ -177,7 +177,7 @@ int erofs_map_blocks_iter(struct inode *inode,
 {
 	/* by default, reading raw data never use erofs_map_blocks_iter */
 	if (unlikely(!is_inode_layout_compression(inode))) {
-		if (*mpage_ret != NULL)
+		if (*mpage_ret)
 			put_page(*mpage_ret);
 		*mpage_ret = NULL;
 
@@ -200,7 +200,7 @@ int erofs_map_blocks(struct inode *inode,
 		int err;
 
 		err = erofs_map_blocks_iter(inode, map, &mpage, flags);
-		if (mpage != NULL)
+		if (mpage)
 			put_page(mpage);
 		return err;
 	}
@@ -232,7 +232,7 @@ static inline struct bio *erofs_read_raw_page(struct bio *bio,
 	}
 
 	/* note that for readpage case, bio also equals to NULL */
-	if (bio != NULL &&
+	if (bio &&
 	    /* not continuous */
 	    *last_block + 1 != current_block) {
 submit_bio_retry:
@@ -240,7 +240,7 @@ static inline struct bio *erofs_read_raw_page(struct bio *bio,
 		bio = NULL;
 	}
 
-	if (bio == NULL) {
+	if (!bio) {
 		struct erofs_map_blocks map = {
 			.m_la = blknr_to_addr(current_block),
 		};
@@ -342,7 +342,7 @@ static inline struct bio *erofs_read_raw_page(struct bio *bio,
 	unlock_page(page);
 
 	/* if updated manually, continuous pages has a gap */
-	if (bio != NULL)
+	if (bio)
 submit_bio_out:
 		__submit_bio(bio, REQ_OP_READ, 0);
 
@@ -408,7 +408,7 @@ static int erofs_raw_access_readpages(struct file *filp,
 	DBG_BUGON(!list_empty(pages));
 
 	/* the rare case (end in gaps) */
-	if (unlikely(bio != NULL))
+	if (unlikely(bio))
 		__submit_bio(bio, REQ_OP_READ, 0);
 	return 0;
 }