Fix an sdp module usage example codec compilation error (patch #2031162)

darcs-hash:20080804181209-3cf82-c19c4958eb0897d9a8bb0dd3660bdd734e233429.gz

libsofia-sip-ua/sdp/sdp.docs

@@ -106,7 +106,7 @@ size_t increment_sdp_version(char buf[], size_t bsize,
   }
   else {
     fprintf(stderr, "increment_sdp_version: %s\n", 
-            sdp_parsing_error(p));
+            sdp_parsing_error(parser));
   }
 
   sdp_parser_free(parser);