state: temporary silence pyflakes warning by removing variable assignment

The variable 'version' is going to be used in upcoming series where we will be
using the version number to read a certain state file. However currently,
pyflakes fails because of the variable not being used. Let's remove the
assignment temporarily so that buildbots and test-suite is happy until I iterate
over remaining part of the series.

Differential Revision: https://phab.mercurial-scm.org/D3641

mercurial/state.py

@@ -70,7 +70,7 class cmdstate(object):
         data in the same format as it was before storing"""
         with self._repo.vfs(self.fname, 'rb') as fp:
             try:
-                version = int(fp.readline())
+                int(fp.readline())
             except ValueError:
                 raise error.ProgrammingError("unknown version of state file"
                                              " found")