pinctrl: single: Move test PCS_HAS_PINCONF in pcs_parse_bits_in_pinctrl_entry() to the beginning

The value of pcs->flags is not overwritten in function
pcs_parse_bits_in_pinctrl_entry() and its subfunctions, so moving this
check to the beginning of the function eliminates unnecessary rollback
operations.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20210722033930.4034-3-thunder.leizhen@huawei.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-single.c

@@ -1115,7 +1115,7 @@ static int pcs_parse_bits_in_pinctrl_entry(struct pcs_device *pcs,
 {
 	const char *name = "pinctrl-single,bits";
 	struct pcs_func_vals *vals;
-	int rows, *pins, found = 0, res = -ENOMEM, i, fsel, gsel;
+	int rows, *pins, found = 0, res = -ENOMEM, i, fsel;
 	int npins_in_row;
 	struct pcs_function *function = NULL;
 
@@ -1125,6 +1125,11 @@ static int pcs_parse_bits_in_pinctrl_entry(struct pcs_device *pcs,
 		return -EINVAL;
 	}
 
+	if (PCS_HAS_PINCONF) {
+		dev_err(pcs->dev, "pinconf not supported\n");
+		return -ENOTSUPP;
+	}
+
 	npins_in_row = pcs->width / pcs->bits_per_pin;
 
 	vals = devm_kzalloc(pcs->dev,
@@ -1212,30 +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;
-	}
 
 	(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
 	(*map)->data.mux.group = np->name;
 	(*map)->data.mux.function = np->name;
 
-	if (PCS_HAS_PINCONF) {
-		dev_err(pcs->dev, "pinconf not supported\n");
-		res = -ENOTSUPP;
-		goto free_pingroups;
-	}
-
 	*num_maps = 1;
 	mutex_unlock(&pcs->mutex);
 
 	return 0;
 
-free_pingroups:
-	pinctrl_generic_remove_group(pcs->pctl, gsel);
-	*num_maps = 1;
 free_function:
 	pinmux_generic_remove_function(pcs->pctl, fsel);
 free_pins: