bundle2: fix broken compression engine assertion
bundletype() is a function, so it needs to be called, and it is
documented to return a 2-tuple. This code is untested, so that's why
we haven't noticed the bad assertion.
Differential Revision: https://phab.mercurial-scm.org/D5155
warning
error
b'buffered\n'
colored? True
colored? True