[PATCH] isofs: remove d_splice_alias NULL check from isofs_lookup

Remove redundant NULL check in isofs_lookup() as d_splice_alias() can take
NULL inode as input.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>