staging: lustre: ldlm: Replace kmem_cache_alloc with kmem_cache_zalloc

Use kmem_cache_zalloc instead of manually setting kmem_cache_alloc
with flag GFP_ZERO since kmem_alloc_zalloc sets allocated memory
to zero.

The Coccinelle semantic patch used to make this change is as
follows:
// <smpl>
@@
expression e,f;
@@
- kmem_cache_alloc(e, f |__GFP_ZERO)
+ kmem_cache_zalloc(e, f)
// </smpl>
Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/ldlm/ldlm_extent.c

@@ -115,7 +115,7 @@ struct ldlm_interval *ldlm_interval_alloc(struct ldlm_lock *lock)
 	struct ldlm_interval *node;
 
 	LASSERT(lock->l_resource->lr_type == LDLM_EXTENT);
-	node = kmem_cache_alloc(ldlm_interval_slab, GFP_NOFS | __GFP_ZERO);
+	node = kmem_cache_zalloc(ldlm_interval_slab, GFP_NOFS);
 	if (!node)
 		return NULL;
 

drivers/staging/lustre/lustre/ldlm/ldlm_lock.c

@@ -406,7 +406,7 @@ static struct ldlm_lock *ldlm_lock_new(struct ldlm_resource *resource)
 
 	LASSERT(resource);
 
-	lock = kmem_cache_alloc(ldlm_lock_slab, GFP_NOFS | __GFP_ZERO);
+	lock = kmem_cache_zalloc(ldlm_lock_slab, GFP_NOFS);
 	if (!lock)
 		return NULL;
 

drivers/staging/lustre/lustre/ldlm/ldlm_resource.c

@@ -1041,7 +1041,7 @@ static struct ldlm_resource *ldlm_resource_new(void)
 	struct ldlm_resource *res;
 	int idx;
 
-	res = kmem_cache_alloc(ldlm_resource_slab, GFP_NOFS | __GFP_ZERO);
+	res = kmem_cache_zalloc(ldlm_resource_slab, GFP_NOFS);
 	if (!res)
 		return NULL;