Fixes checkpatch.pl checks:
CHECK: Comparison to NULL could be written ...
Signed-off-by: Ryan Van Quinlan <ryan.van.quinlan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
        struct ccc_object *vob = cl_inode2ccc(inode);
        void          *results[1];
 
-       if (inode->i_mapping != NULL)
+       if (inode->i_mapping)
                cnt += radix_tree_gang_lookup_tag(&inode->i_mapping->page_tree,
                                                  results, 0, 1,
                                                  PAGECACHE_TAG_DIRTY);
                                               current);
                        cio->cui_glimpse = 0;
 
-                       if (lock == NULL)
+                       if (!lock)
                                return 0;
 
                        if (IS_ERR(lock))
                *descr = whole_file;
                descr->cld_obj = clob;
                lock = cl_lock_peek(env, io, descr, "localsize", current);
-               if (lock != NULL) {
+               if (lock) {
                        cl_merge_lvb(env, inode);
                        cl_unuse(env, lock);
                        cl_lock_release(env, lock, "localsize", current);