MB-13417: Remove compiler warning in backtrace_test
MB-13417: Remove compiler warning in backtrace_test

Change-Id: Iaeb157d63ff9497a72435859c55dd7aa2e5917a1
Reviewed-on: http://review.couchbase.org/46966
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

vmx/platform,vmx/platform