Fix fuzzer error for FormatConvertFuzzer

FormatConvert have some restructions
on the width and height.

The logic to ensure width is even,
and height is divisible by 16 is wrong.
Fix it.

Bug: 230733449
Test: FormatConvertFuzzer_copyNV21toRGB32
Change-Id: Ic52c1eea1ea89625db31538c97e49903af6958dc
1 file changed