msm: ipa: IPA wdi_disconnect put memset after decrement clock

Change the decrement to happen before the memset so the right
client associated with the wdi pipe is decremented.

Change-Id: I17057be63f283ae42e91a841f3e8a5ccac6fa554
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>