nfs: allow coalescing of subpage requests

Remove check that the request covers a whole page.

Signed-off-by: Weston Andros Adamson <[e-mail]>
Signed-off-by: Trond Myklebust <[e-mail]>

fs/nfs/pagelist.c

···
 		    !nfs_match_lock_context(req->wb_lock_context,
 					    prev->wb_lock_context))
 			return false;
-		if (req->wb_pgbase != 0)
-			return false;
-		if (prev->wb_pgbase + prev->wb_bytes != PAGE_CACHE_SIZE)
-			return false;
 		if (req_offset(req) != req_offset(prev) + prev->wb_bytes)
 			return false;
 	}