Handle error returned by IBurstContext::freeMemory

Unhandled HIDL errors result in a crash. This CL handles any errors from
IBurstContext::freeMemory by logging the error and continuing with the
rest of the function.

Bug: N/A
Test: mma
Change-Id: Ic433a627137df4d275a1b0d2d800d592afc1a18c