vp8: common: postproc: fix signed overflow of statement of (X +c) >= X when '-Werror=strict-overflow' is set.
vp8: common: postproc: fix signed overflow of statement of (X +c) >= X when '-Werror=strict-overflow' is set.

Change-Id: I2f78417cc100973c732426f7b6bd10d7304a1a5f

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