eglReleaseThread() was leaking some memory because even though it
deletes the 'current' thread state, it was inadvertently getting
re-allocated when recording the success error state.

Change-Id: I92efb1b34e62a21998b4fc19aaeba6473b06548b
Reviewed-on: https://swiftshader-review.googlesource.com/11968Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>