regulator: Fix the s5m8767a problem of the division by null
regulator: Fix the s5m8767a problem of the division by null

If ramp_delay is 0, delay value can be divided by zero.
This patch can fix the problem.

Signed-off-by: Sangbeom Kim <8f8c58bd4462a0bbd2070cd6f3da233ca14a58a9@samsung.com>
Signed-off-by: Mark Brown <b51b9a92386687a9ac927cebfa0f978adeb8cea5@opensource.wolfsonmicro.com>

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