kernel/gcov/fs.c: remove unnecessary null test before debugfs_remove

This fixes checkpatch warning:

  WARNING: debugfs_remove(NULL) is safe this check is probably not required
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Cc: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/gcov/fs.c

@@ -784,7 +784,6 @@ static __init int gcov_fs_init(void)
 
 err_remove:
 	pr_err("init failed\n");
-	if (root_node.dentry)
 	debugfs_remove(root_node.dentry);
 
 	return rc;