staging: atomisp_fops: Clean up tests if NULL returned on failure

Some functions like kmalloc/kzalloc return NULL on failure.
When NULL represents failure, !x is commonly used.

This was done using Coccinelle:
@@
expression *e;
identifier l1;
@@

e = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\)(...);
...
- e == NULL
+ !e
Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c

@@ -1100,7 +1100,7 @@ int atomisp_videobuf_mmap_mapper(struct videobuf_queue *q,
 			continue;
 
 		map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
-		if (map == NULL) {
+		if (!map) {
 			mutex_unlock(&q->vb_lock);
 			return -ENOMEM;
 		}