USB: gadgetfs: do not WARN about excessively large memory allocations

GadgetFS passes an excessively large user input len to kmalloc and kmalloc
gives a WARN (see below for details).  Suppress it by passing __GFP_NOWARN
to kmalloc used by both ep_write_iter() and ep_read_iter().  Follow the
same method as commit 4f2629ea67e72 ("USB: usbfs: Don't WARN about
excessively large memory allocations").

kmalloc is used to allocate physically contiguous memory for kernel
allocations.  For requests larger than KMALLOC_MAX_CACHE_SIZE, kmalloc
uses the page allocator and can only support up to KMALLOC_MAX_SIZE.  For
request sizes bigger than KMALLOC_MAX_SIZE, the page allocator can emit a
WARN because kmalloc allocates an order greater than MAX_PAGE_ORDER.

Link: https://lore.kernel.org/DKTTMAS94IMH.2C6ERY0ZIVWVZ@nvidia.com
Fixes: b3c466ce5129 ("page allocator: do not sanity check order in the fast path")
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reported-by: syzbot+805630f1453e490427fa@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/6a820ebc.9ebadd4d.20b15e.001b.GAE@google.com/
Tested-by: syzbot+805630f1453e490427fa@syzkaller.appspotmail.com
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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