drivers: qcom: rpmh: fix unwanted error check for get_tcs_of_type()

The patch fixes the bug reported by Dan Carpenter.
It removes the unnecessary err check for ‘tcs’ reported by
static checker warning:

drivers/soc/qcom/rpmh-rsc.c:111 tcs_invalidate()
warn: 'tcs' isn't an ERR_PTR
See also:
drivers/soc/qcom/rpmh-rsc.c:178 get_tcs_for_msg() warn: 'tcs' isn't
an ERR_PTR
drivers/soc/qcom/rpmh-rsc.c:180 get_tcs_for_msg() warn: 'tcs' isn't
an ERR_PTR

https://www.spinics.net/lists/linux-soc/msg04624.html

Fixes: 9a3afcf ("drivers: qcom: rpmh-rsc: allow invalidation
of sleep/wake TCS")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Raju P.L.S.S.S.N <rplsssn@codeaurora.org>
Reviewed-by: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

drivers/soc/qcom/rpmh-rsc.c

@@ -108,8 +108,6 @@ static int tcs_invalidate(struct rsc_drv *drv, int type)
 	struct tcs_group *tcs;
 
 	tcs = get_tcs_of_type(drv, type);
-	if (IS_ERR(tcs))
-		return PTR_ERR(tcs);
 
 	spin_lock(&tcs->lock);
 	if (bitmap_empty(tcs->slots, MAX_TCS_SLOTS)) {
@@ -175,9 +173,9 @@ static struct tcs_group *get_tcs_for_msg(struct rsc_drv *drv,
 	 * TCSes before making an active state request.
 	 */
 	tcs = get_tcs_of_type(drv, type);
-	if (msg->state == RPMH_ACTIVE_ONLY_STATE && IS_ERR(tcs)) {
+	if (msg->state == RPMH_ACTIVE_ONLY_STATE && !tcs->num_tcs) {
 		tcs = get_tcs_of_type(drv, WAKE_TCS);
-		if (!IS_ERR(tcs)) {
+		if (tcs->num_tcs) {
 			ret = rpmh_rsc_invalidate(drv);
 			if (ret)
 				return ERR_PTR(ret);