Added missing resource initialization in order to prevent getting
"uninitialized value" errors when running the fuzzer.

Change-Id: I342441832a159b79cbf036d7ce87f05fcaf15e8c
Reviewed-on: https://swiftshader-review.googlesource.com/17128Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>