Fixes of unreleased buffer, deadcode and wrong variable type detected
by coverity scan.
Addresses-Coverity-ID: 510809: Resource leaks (RESOURCE_LEAK)
Addresses-Coverity-ID: 510806: Control flow issues (DEADCODE)
Addresses-Coverity-ID: 510794 Control flow issues (NO_EFFECT)
Signed-off-by: Raymond Mao <raymond.mao@linaro.org>