staging: erofs: Use !x or x in place of NULL comparision

Test for NULL as !x instead of NULL comparisions.
Issue found using coccinelle
Semantic patch used to solve the problem is as follows

// <smpl>
@@
expression x;
statement S;
@@

x = (\(kmalloc\|devm_kzalloc\|kmalloc_array\|devm_ioremap\|
usb_alloc_urb\|alloc_netdev\|dev_alloc_skb\)(...));

-if(x==NULL)
+if(!x)
S

@@
expression e;
@@

-e == NULL
+!e
// </smpl>

Signed-off-by: Bhanusree Pola <bhanusreemahesh@gmail.com>
[ Gao Xiang: fix x != NULL comparision to x as well. ]
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/staging/erofs/unzip_pagevec.h b/drivers/staging/erofs/unzip_pagevec.h
index 23856ba2742d..f37d8fd14771 100644
--- a/drivers/staging/erofs/unzip_pagevec.h
+++ b/drivers/staging/erofs/unzip_pagevec.h
@@ -43,7 +43,7 @@ struct z_erofs_pagevec_ctor {
 static inline void z_erofs_pagevec_ctor_exit(struct z_erofs_pagevec_ctor *ctor,
 					     bool atomic)
 {
-	if (ctor->curr == NULL)
+	if (!ctor->curr)
 		return;
 
 	if (atomic)
@@ -59,7 +59,7 @@ z_erofs_pagevec_ctor_next_page(struct z_erofs_pagevec_ctor *ctor,
 	unsigned index;
 
 	/* keep away from occupied pages */
-	if (ctor->next != NULL)
+	if (ctor->next)
 		return ctor->next;
 
 	for (index = 0; index < nr; ++index) {
@@ -121,7 +121,7 @@ z_erofs_pagevec_ctor_enqueue(struct z_erofs_pagevec_ctor *ctor,
 			     bool *occupied)
 {
 	*occupied = false;
-	if (unlikely(ctor->next == NULL && type))
+	if (unlikely(!ctor->next && type))
 		if (ctor->index + 1 == ctor->nr)
 			return false;