Fix unused-but-set-variable warnings

warning: variable 'ret' set but not used [-Wunused-but-set-variable]
warning: variable 'ancount' set but not used [-Wunused-but-set-variable]
warning: variable 'result' set but not used [-Wunused-but-set-variable]

Bug: N/A
Test: atest
Change-Id: I8e917035f4199685425482222ae44a674a90b1b7