power: fuel_gauge: sprd2713: fix division by zero during initialization

power: fuel_gauge: sprd2713: fix division by zero during initialization

This patch fixes following division by zero during initialization.

  Division by zero in kernel.
  CPU: 1 PID: 1 Comm: swapper/0 Not tainted 3.10.65 #1-Tizen
  [<c00153bc>] (unwind_backtrace+0x0/0x118) from [<c0013010>] (show_stack+0x10/0x14)
  [<c0013010>] (show_stack+0x10/0x14) from [<c021487c>] (Ldiv0+0x8/0x10)
  [<c021487c>] (Ldiv0+0x8/0x10) from [<c043b184>] (:+0x38c/0xb70)
  [<c043b184>] (sprdfgu_init+0x38c/0xb70) from [<c0438b00>] (sec_hal_fg_init+0x1b0/0x22c)
  [<c0438b00>] (sec_hal_fg_init+0x1b0/0x22c) from [<c043965c>] (sec_fuelgauge_probe+0x154/0x2fc)
  [<c043965c>] (sec_fuelgauge_probe+0x154/0x2fc) from [<c02c1b14>] (driver_probe_device+0x124/0x32c)
  [<c02c1b14>] (driver_probe_device+0x124/0x32c) from [<c02c1dc8>] (__driver_attach+0x68/0x8c)
  [<c02c1dc8>] (__driver_attach+0x68/0x8c) from [<c02bfffc>] (bus_for_each_dev+0x68/0x8c)
  [<c02bfffc>] (bus_for_each_dev+0x68/0x8c) from [<c02c1120>] (bus_add_driver+0x104/0x240)
  [<c02c1120>] (bus_add_driver+0x104/0x240) from [<c02c2340>] (driver_register+0x9c/0x120)
  [<c02c2340>] (driver_register+0x9c/0x120) from [<c0009550>] (do_one_initcall+0xb8/0x160)
  [<c0009550>] (do_one_initcall+0xb8/0x160) from [<c09c6be4>] (kernel_init_freeable+0x158/0x220)
  [<c09c6be4>] (kernel_init_freeable+0x158/0x220) from [<c06c2efc>] (kernel_init+0x8/0xe8)
  [<c06c2efc>] (kernel_init+0x8/0xe8) from [<c000f258>] (ret_from_fork+0x14/0x3c)

Change-Id: Iba009b1eab23c34456c8d2b0283efda4b003498b
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>