V4L/DVB (5036): Pvrusb2: Fix for min/max control value checking

In the previous patch we exploited the get_{min,max}_value facility to adjust
min/max allowable frequencies on the fly, depending on tuner mode.

Unfortunately, this facility was not used inside the *sym_to_val() function
that translates what we echo to sysfs, which means we got an -ERANGE despite
asking for a frequency between what we read to be min/max.
This patch corrects this small omission.
Signed-off-by: Pantelis Koukousoulas <pakt223@freemail.gr>
Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/pvrusb2/pvrusb2-ctrl.c

@@ -498,11 +498,20 @@ int pvr2_ctrl_sym_to_value(struct pvr2_ctrl *cptr,
 	LOCK_TAKE(cptr->hdw->big_lock); do {
 		if (cptr->info->type == pvr2_ctl_int) {
 			ret = parse_token(ptr,len,valptr,NULL,0);
-			if ((ret >= 0) &&
-			    ((*valptr < cptr->info->def.type_int.min_value) ||
-			     (*valptr > cptr->info->def.type_int.max_value))) {
+			if (ret >= 0) {
+				int min, max;
+				min = cptr->info->def.type_int.min_value;
+				if (cptr->info->get_min_value) {
+					cptr->info->get_min_value(cptr,&min);
+				}
+				max = cptr->info->def.type_int.max_value;
+				if (cptr->info->get_max_value) {
+					cptr->info->get_max_value(cptr,&max);
+				}
+				if ((*valptr < min) || (*valptr > max)) {
 					ret = -ERANGE;
 				}
+			}
 			if (maskptr) *maskptr = ~0;
 		} else if (cptr->info->type == pvr2_ctl_bool) {
 			ret = parse_token(