FS-Cache: Remove unneeded null checks

fscache_write_op() makes unnecessary checks of the page variable to see if it
is NULL.  It can't be NULL at those points as the kernel would already have
crashed a little higher up where we examined page->index.

Furthermore, unless radix_tree_gang_lookup_tag() can return 1 but no page, a
NULL pointer crash should not be encountered there as we can only get there if
r_t_g_l_t() returned 1.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/fscache/page.c

@@ -710,17 +710,14 @@ static void fscache_write_op(struct fscache_operation *_op)
 		goto superseded;
 	}
 
-	if (page) {
 	radix_tree_tag_set(&cookie->stores, page->index,
 			   FSCACHE_COOKIE_STORING_TAG);
 	radix_tree_tag_clear(&cookie->stores, page->index,
 			     FSCACHE_COOKIE_PENDING_TAG);
-	}
 
 	spin_unlock(&cookie->stores_lock);
 	spin_unlock(&object->lock);
 
-	if (page) {
 	fscache_set_op_state(&op->op, "Store");
 	fscache_stat(&fscache_n_store_pages);
 	fscache_stat(&fscache_n_cop_write_page);
@@ -734,7 +731,6 @@ static void fscache_write_op(struct fscache_operation *_op)
 	} else {
 		fscache_enqueue_operation(&op->op);
 	}
-	}
 
 	_leave("");
 	return;