Have dbind_method_call_reentrant_va check the signature of replies
Have dbind_method_call_reentrant_va check the signature of replies

When making a method call, we should check that the signature of the
reply matches what we expect and throw an error if not. Otherwise we may
crash.

GNOME/at-spi2-core,GNOME/at-spi2-core,GNOME/at-spi2-core