[PATCH 5 of 9] Fix comparison signedness warnings

[Matthias Andree]

# HG changeset patch
# User Matthias Andree <matthias.and...@gmx.de>
# Date 1281124462 -7200
# Branch HEAD
# Node ID 55eac87c65e021bf663875e931f2868491251d07
# Parent  151598faceaeab3c37f1de4274fc8324a88f27f5
Fix comparison signedness warnings.

diff --git a/pop_auth.c b/pop_auth.c
--- a/pop_auth.c
+++ b/pop_auth.c
@@ -178,7 +178,7 @@
   unsigned char digest[16];
   char hash[33];
   char buf[LONG_STRING];
-  int i;
+  size_t i;
 
   if (!pop_data->timestamp)
     return POP_A_UNAVAIL;