google_charger: correct return in fcc set_cur_state callback function Return 0 at the end of the function Bug: 243883583 Signed-off-by: Jack Wu <[email protected]> Change-Id: I8f60181a58c45f6b518f645c3cc9f68b63b433da (cherry picked from commit 98b6920f923977747fe1ecd4634d469f99c20b14)