UBI: simplify image sequence test
The test: if (!a && b) a = b; can be symplified in: if (!a) a = b; And there's no need to test if ubi->image_seq is not null, because if it is, it is set to image_seq. So, we just test if image_seq is not null. Signed-off-by: NRichard Genoud <richard.genoud@gmail.com> Signed-off-by: NRichard Weinberger <richard@nod.at> Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
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