UPSTREAM: swiotlb: Fix the type of index

[ Upstream commit 95b079d8 ]

Fix the type of index from unsigned int to int since find_slots() might
return -1.

Fixes: 26a7e094 ("swiotlb: refactor swiotlb_tbl_map_single")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Claire Chang <tientzu@chromium.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit a01572e2)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I352263b74ff89334c1e3fd6f1b70e1c08b7f2b47