libaudiohal@aidl: Fix 'localReply' scope in 'sendCommand'

Make sure that 'localReply' is available all the time
it is being accessed.

Bug: 333116473
Bug: 335014456
Test: m
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f84ae5370242ec407ea143ca98eb1ffd78cf1f15)
Merged-In: I70a8fc7fb710a7a288509af3f8a57d0695c53b1a
Change-Id: I70a8fc7fb710a7a288509af3f8a57d0695c53b1a