bus: ti-sysc: Fix optional clocks array access

We should be checking ddata->clocks[i] instead of clock_names[i]
for the optional clocks. Currently this just happens to work for
the typical case of one fck and one optional clock.

Fixes: 09dfe5810762 ("bus: ti-sysc: Add handling for clkctrl opt clocks")
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/bus/ti-sysc.c

@@ -128,7 +128,7 @@ static int sysc_get_one_clock(struct sysc *ddata, const char *name)
 
 	if (index < 0) {
 		for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
-			if (!clock_names[i]) {
+			if (!ddata->clocks[i]) {
 				index = i;
 				break;
 			}