video: mb862xxfb: prevent divide by zero bug
video: mb862xxfb: prevent divide by zero bug

Do a sanity check on these before using them as divisors.

Signed-off-by: Dan Carpenter <ff341aa343d564f9e53e9dcb6996be8c04859a66@oracle.com>
Acked-by: Anatolij Gustschin <f79f5d5f0b8928b7f49f0262a90d53ad98a87c22@denx.de>
Signed-off-by: Florian Tobias Schandinat <9843642cd7809d7c6d8c25ac9e4b0e2f1b5283bf@gmx.de>

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