power: supply: ab8500: Fix the error handling path of ab8500_charger_probe()

Since the commit below, ab8500_bm_of_remove() needs to be called after a
successful ab8500_bm_of_probe() call.
This commit has only updated the remove function.

Fix the error handling path of the probe the same way.

Fixes: 6252c706

 ("power: supply: ab8500: Standardize operating temperature")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>