Cache attempt to close file

Attempt to close the file passed to the get callback function.  Closing
is the right thing to do, but it is possible that the user will close it
before returning..

libsaria/cache.py

@@ -21,6 +21,10 @@ class CacheObject:
 			f = open(path, 'w')
 			if func(f, *args):
 				return path
+			try:
+				f.close()
+			except:
+				pass
 		else:
 			return path