Simplifying the initialisation flow for it85spi

1) Inlining it85xx_spi_common_init since it's only used once in
it85xx_spi_init, after inlining ret value is not needed.

2) Moving data allocation closer to the end of init function to
avoid freeing data in case of early return on error.

BUG=b:172876667
TEST=builds

Change-Id: Iac1b4ae9c6f34c5265e729ae0a80024800c3c272
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
---
M it85spi.c
1 file changed, 58 insertions(+), 68 deletions(-)