Fix to return -ENOTSUPP instead of 0 when PCS_HAS_PINCONF is true, which
is the same as that returned in pcs_parse_pinconf().

In addition, I found the value of pcs->flags is not overwritten in
pcs_parse_bits_in_pinctrl_entry() and its subfunctions, so moving this
check to the beginning of the function eliminates unnecessary rollback
operations.

Fixes: 4e7e8017a80e ("pinctrl: pinctrl-single: enhance to configure multiple pins of different modules")
Reported-by: Hulk Robot <redacted>
Signed-off-by: Zhen Lei <redacted>
---
  drivers/pinctrl/pinctrl-single.c | 21 ++++++++-------------
  1 file changed, 8 insertions(+), 13 deletions(-)


  	npins_in_row = pcs->width / pcs->bits_per_pin;
  
  	vals = devm_kzalloc(pcs->dev,

@@ -1212,29 +1217,19 @@ static int pcs_parse_bits_in_pinctrl_entry(struct pcs_device *pcs,
  		goto free_pins;
  	}
  
-	gsel = pinctrl_generic_add_group(pcs->pctl, np->name, pins, found, pcs);
-	if (gsel < 0) {
-		res = gsel;
+	res = pinctrl_generic_add_group(pcs->pctl, np->name, pins, found, pcs);
+	if (res < 0)
  		goto free_function;
-	}