orangefs: Adjust three checks for null pointers

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The script “checkpatch.pl” pointed information out like the following.

Comparison to NULL could be written !…

Thus fix affected source code places.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

fs/orangefs/acl.c

@@ -35,7 +35,7 @@ struct posix_acl *orangefs_get_acl(struct inode *inode, int type)
 	 * I don't do that for now.
 	 */
 	value = kmalloc(ORANGEFS_MAX_XATTR_VALUELEN, GFP_KERNEL);
-	if (value == NULL)
+	if (!value)
 		return ERR_PTR(-ENOMEM);
 
 	gossip_debug(GOSSIP_ACL_DEBUG,

fs/orangefs/xattr.c

@@ -239,7 +239,7 @@ int orangefs_inode_setxattr(struct inode *inode, const char *name,
 	internal_flag = convert_to_internal_xattr_flags(flags);
 
 	/* This is equivalent to a removexattr */
-	if (size == 0 && value == NULL) {
+	if (size == 0 && !value) {
 		gossip_debug(GOSSIP_XATTR_DEBUG,
 			     "removing xattr (%s)\n",
 			     name);
@@ -311,7 +311,7 @@ ssize_t orangefs_listxattr(struct dentry *dentry, char *buffer, size_t size)
 	int i = 0;
 	int returned_count = 0;
 
-	if (size > 0 && buffer == NULL) {
+	if (size > 0 && !buffer) {
 		gossip_err("%s: bogus NULL pointers\n", __func__);
 		return -EINVAL;
 	}