smb: client: Fix a NULL vs IS_ERR() check in wsl_set_xattrs()

This was intended to be an IS_ERR() check.  The ea_create_context()
function doesn't return NULL.

Fixes: 1eab17fe485c ("smb: client: add support for WSL reparse points")
Reviewed-by: Paulo Alcantara <pc@manguebit.com>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/reparse.c

@@ -230,7 +230,7 @@ static int wsl_set_xattrs(struct inode *inode, umode_t _mode,
 	}
 
 	cc = ea_create_context(dlen, &cc_len);
-	if (!cc)
+	if (IS_ERR(cc))
 		return PTR_ERR(cc);
 
 	ea = &cc->ea;