pinctrl: fix comment mistake

This variable pertains to pinctrl handles not muxes
specifically.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 5cdee86..59f5a96 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -700,7 +700,7 @@
 		}
 	}
 
-	/* Add the pinmux to the global list */
+	/* Add the pinctrl handle to the global list */
 	list_add_tail(&p->node, &pinctrl_list);
 
 	return p;