fsl: sys_eeprom: Fix 'may be used uninitialized' warning

The warning is bogus, so silence it by initializing the 'ret' variable.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>