use if 'x' in s instead of str.find()

It's more readable.

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

koji/__init__.py

@@ -1053,7 +1053,7 @@ def _check_NVRA(nvra):
 def is_debuginfo(name):
     """Determines if an rpm is a debuginfo rpm, based on name"""
     if name.endswith('-debuginfo') or name.endswith('-debugsource') or \
-            name.find('-debuginfo-') != -1:
+            '-debuginfo-' in name:
         return True
     return False