mm/vmalloc: eliminate an extra orig_gfp_mask

That extra variable has been introduced just for keeping an original
passed gfp_mask because it is updated with __GFP_NOWARN on entry, thus
error handling messages were broken.

Instead we can keep an original gfp_mask without modifying it and add an
extra __GFP_NOWARN flag together with gfp_mask as a parameter to the
vm_area_alloc_pages() function.  It will make it less confused.

Link: https://lkml.kernel.org/r/20220119143540.601149-3-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Vasily Averin <vvs@virtuozzo.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>
Cc: Uladzislau Rezki <uladzislau.rezki@sony.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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