Fix warnings

[SVN r52439]

Author: vprus

src/cmdline.cpp

@@ -272,16 +272,16 @@ namespace boost { namespace program_options { namespace detail {
             if (!xd)
                 continue;
 
-            int min_tokens = xd->semantic()->min_tokens();
-            int max_tokens = xd->semantic()->max_tokens();
+            unsigned min_tokens = xd->semantic()->min_tokens();
+            unsigned max_tokens = xd->semantic()->max_tokens();
             if (min_tokens < max_tokens && opt.value.size() < max_tokens)
             {
                 // This option may grab some more tokens.
                 // We only allow to grab tokens that are not already
                 // recognized as key options.
 
                 int can_take_more = max_tokens - opt.value.size();
-                int j = i+1;
+                unsigned j = i+1;
                 for (; can_take_more && j < result.size(); --can_take_more, ++j)
                 {
                     option& opt2 = result[j];