pmap: correct 'rh analysis #2' patch and contrib document

pmap.c

@@ -417,7 +417,8 @@ int main(int argc, char **argv)
 				arg2 = strchr(arg1, ',');
 				if (arg2)
 					*arg2 = '\0';
-				arg2 = *arg2 ? arg2++ : arg1;
+				if(arg2) ++arg2;
+				else arg2 = arg1;
 
 				if (*arg1)
 					range_low = STRTOUKL(arg1, &arg1, 16);