power: supply: core: Break capacity loop

We should not go on looking for more capacity tables after
we realize we have looked at the last one in
power_supply_find_ocv2cap_table().

Fixes: 3afb50d7

 ("power: supply: core: Add some helpers to use the battery OCV capacity table")
Cc: Chunyan Zhang <chunyan.zhang@unisoc.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>