xcp/repository.py: Fixup unclosed file warning left from #27

Fixup the unclosed file warning which was introduced by commit 08f000
(xcp.repository: switch from ConfigParser to configparser) in #27.

PS: Because I'm using pre-commit now, also remove a line which had
    trailing spaces

Signed-off-by: Bernhard Kaindl <bernhard.kaindl@cloud.com>

Author: bernhardkaindl

xcp/repository.py

@@ -136,7 +136,6 @@ def getRepoVer(cls, access):
         access.start()
         is_yum = YumRepository.isRepo(access, "")
         access.finish()
-        
         if is_yum:
             return YumRepository.getRepoVer(access)
         return Repository.getRepoVer(access)
@@ -190,7 +189,8 @@ def _getVersion(cls, access, category):
                 treeinfofp = io.TextIOWrapper(rawtreeinfofp, encoding='utf-8')
             treeinfo = configparser.ConfigParser()
             treeinfo.read_file(treeinfofp)
-            treeinfofp = None
+            if treeinfofp != rawtreeinfofp:
+                treeinfofp.close()
             rawtreeinfofp.close()
             if treeinfo.has_section('system-v1'):
                 ver_str = treeinfo.get('system-v1', category_map[category])