isp1704_charger: Correct length for storing model
isp1704_charger: Correct length for storing model

Model should have room to accommodate the trailing null byte,
"isp170[4|7]\0".

Signed-off-by: Ameya Palande <061a9416313789ad6fd61add2df400fec058ce64@nokia.com>
Acked-by: Heikki Krogerus <0364a60538b3766c953bdea7e7e4859afd98436c@nokia.com>
Signed-off-by: Anton Vorontsov <1d765a3da7f714ffaadb979466c507aa3415181f@gmail.com>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas