fixes bug 283659 "punycode.c:130: warning: signed and unsigned type in conditional expression" patch by baafie@planet.nl r+sr=darin

netwerk/dns/src/punycode.c

@@ -127,7 +127,7 @@ enum punycode_status punycode_encode(
     if (basic(input[j])) {
       if (max_out - out < 2) return punycode_big_output;
       output[out++] =
-        case_flags ?  encode_basic(input[j], case_flags[j]) : input[j];
+        case_flags ? encode_basic(input[j], case_flags[j]) : (char)input[j];
     }
     /* else if (input[j] < n) return punycode_bad_input; */
     /* (not needed for Punycode with unsigned code points) */