pinctrl: thunderbay: fix possible memory leak in thunderbay_build_functions()

The thunderbay_add_functions() will free memory of thunderbay_funcs
when everything is ok, but thunderbay_funcs will not be freed when
thunderbay_add_functions() fails, then there will be a memory leak,
so we need to add kfree() when thunderbay_add_functions() fails to
fix it.

In addition, doing some cleaner works, moving kfree(funcs) from
thunderbay_add_functions() to thunderbay_build_functions().

Fixes: 12422af8 ("pinctrl: Add Intel Thunder Bay pinctrl driver")
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Reviewed-by: Rafał Miłecki <rafal@milecki.pl>
Link: https://lore.kernel.org/r/20221129120126.1567338-1-cuigaosheng1@huawei.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-thunderbay.c

@@ -808,7 +808,7 @@ static int thunderbay_add_functions(struct thunderbay_pinctrl *tpc, struct funct
 					    funcs[i].num_group_names,
 					    funcs[i].data);
 	}
-	kfree(funcs);
+
 	return 0;
 }
 
@@ -817,6 +817,7 @@ static int thunderbay_build_functions(struct thunderbay_pinctrl *tpc)
 	struct function_desc *thunderbay_funcs;
 	void *ptr;
 	int pin;
+	int ret;
 
 	/*
 	 * Allocate maximum possible number of functions. Assume every pin
@@ -860,7 +861,10 @@ static int thunderbay_build_functions(struct thunderbay_pinctrl *tpc)
 		return -ENOMEM;
 
 	thunderbay_funcs = ptr;
-	return thunderbay_add_functions(tpc, thunderbay_funcs);
+	ret = thunderbay_add_functions(tpc, thunderbay_funcs);
+
+	kfree(thunderbay_funcs);
+	return ret;
 }
 
 static int thunderbay_pinconf_set_tristate(struct thunderbay_pinctrl *tpc,