debuggerd_client: fix infinite timeouts.

Bug: http://b/36897117
Test: debuggerd_test
Test: debuggerd -b `pidof zygote`
Change-Id: I743433bc420b1c433b82ef62795abb6ea9f5d840
(cherry picked from commit 287d50dc590cc00642783476d33e569066c0fcca)
3 files changed