fix wrong var name in OSFS.getinfo() conversion of st_mtime => modified_time
fix wrong var name in OSFS.getinfo() conversion of st_mtime => modified_time


Konubinix/pyfilesystem,flying-circus/pyfilesystem,rivenz/pyfilesystem,pmitros/pyfs,piranna/pyfilesystem,pombreda/pyfilesystem,pmitros/pyfs,zopyx/pyfilesystem,PyFilesystem/pyfilesystem