Fix [ 1933736 ] "frequency" command segfaults without args

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1172 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

jtag/ChangeLog

@@ -1,3 +1,8 @@
+2008-04-19  Kolja Waschk <kawk>
+
+   * src/cmd/frequency.c: ensure that cable is initialized. Fixes
+     [ 1933736 ] "frequency" command segfaults without args
+
 2008-04-19  Arnim Laeuger  <arniml@users.sourceforge.net>
 
    * src/bsdl/Makefile.am, src/svf/Makefile.am: ensure that

jtag/src/cmd/frequency.c

@@ -36,6 +36,9 @@ cmd_frequency_run( chain_t *chain, char *params[] )
 {
 	unsigned int freq;
 
+	if (!cmd_test_cable( chain ))
+		return 1;
+
 	if (cmd_params( params ) == 1) {
 		printf( _("Current TCK frequency is %u Hz\n"), cable_get_frequency(chain->cable) );
 		return 1;