xarray: remove redundant __GFP_NOWARN

Commit 16f5dfbc851b ("gfp: include __GFP_NOWARN in GFP_NOWAIT") made
GFP_NOWAIT implicitly include __GFP_NOWARN.

Therefore, explicit __GFP_NOWARN combined with GFP_NOWAIT (e.g.,
`GFP_NOWAIT | __GFP_NOWARN`) is now redundant. Let's clean up these
redundant flags across subsystems.

No functional changes.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Qianfeng Rong <[e-mail]>
Cc: Matthew Wilcox (Oracle) <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

lib/xarray.c

···
 	if (node) {
 		xas->xa_alloc = NULL;
 	} else {
-		gfp_t gfp = GFP_NOWAIT | __GFP_NOWARN;
+		gfp_t gfp = GFP_NOWAIT;
 
 		if (xas->xa->xa_flags & XA_FLAGS_ACCOUNT)
 			gfp |= __GFP_ACCOUNT;