Fix warnings emitted by some versions of gcc:
drivers/power/twl4030_charger.c:490: warning: overflow in implicit constant conversion
drivers/power/twl4030_charger.c:498: warning: overflow in implicit constant conversion

While at it, also fix module_param permissions and a typo in my name.
Signed-off-by: NGrazvydas Ignotas <notasas@gmail.com>
Signed-off-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NAnton Vorontsov <cbouatmailru@gmail.com>