CSI < c only takes one manditory argument with default

Fixes bug introduced in cc07b354 where the command without any
parameters would not return anything.

src/conio/cterm.c

@@ -2636,10 +2636,9 @@ static void do_ansi(struct cterminal *cterm, char *retbuf, size_t retsize, int *
 						case 'c':
 							/* SyncTERM Device Attributes */
 							if (seq->param_str[0] == '<' && parse_parameters(seq)) {
+								seq_default(seq, 0, 0);
 								tmp[0] = 0;
-								for (i=0; i<seq->param_count; i++) {
-									seq_default(seq, i, 0);
-									switch (seq->param_int[i]) {
+								switch (seq->param_int[0]) {
 									case 0:		/* Advanced features */
 										strcpy(tmp, "\x1b[<0");
 										if (cio_api.options & CONIO_OPT_LOADABLE_FONTS)
@@ -2658,7 +2657,6 @@ static void do_ansi(struct cterminal *cterm, char *retbuf, size_t retsize, int *
 											strcat(tmp, ";7");
 										strcat(tmp, "c");
 								}
-								}
 								if(retbuf && *tmp && strlen(retbuf) + strlen(tmp) < retsize)
 									strcat(retbuf, tmp);
 							}