gpio: aggregator: Drop pre-initialization in get_arg()

In get_arg(), the variable start is pre-initialized, but overwritten
again in the first statement.  Rework the assignment to not rely on
pre-initialization, to make the code easier to read.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200701114212.8520-2-geert+renesas@glider.beSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-aggregator.c

@@ -38,9 +38,9 @@ static DEFINE_IDR(gpio_aggregator_idr);
 
 static char *get_arg(char **args)
 {
-	char *start = *args, *end;
+	char *start, *end;
 
-	start = skip_spaces(start);
+	start = skip_spaces(*args);
 	if (!*start)
 		return NULL;