arm: mach-msm: qdsp6v2: remove unnecessary write count check

write count is never going to be negative value

Change-Id: Ie9468d4fbcccb2b7df87cbb67d0a911e584c8e62
Signed-off-by: Patrick Lai <plai@codeaurora.org>

Conflicts:

	arch/arm/mach-msm/qdsp6v2/q6core.c