adb: sysdeps_test: improve smoke test.

Make sure that adb_poll sets revents for all of the structs passed in.
Also, zero initialize all of the adb_pollfd structs in the tests.

Change-Id: Ia639679a7e6f77483655f1552e89081c4673aa87
(cherry picked from commit 2275f7da7370d5b403a5d4a9d558c34a38ee5c94)
1 file changed