Fix all those warnings from -Wshadow

git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@964 726aef4b-f618-498e-8847-2d620e286838

modules/savebuff.cpp

@@ -180,7 +180,7 @@ public:
 			if ( DecryptChannel( sArgs, sFile ) )
 			{
 				CString sLine;
-				CString::size_type iPos = 0;
+				iPos = 0;
 				while( ReadLine( sFile, sLine, iPos ) )
 				{
 					sLine.Trim();