dummyflasher.c: Fix data leak in params processing error paths

This patch extracts params processing into a separate function. Now
all error paths of params processing return 1 back to init function
which frees data.

And there was just one more error path in init function where
free(data) needed to be added.

This is a follow up on commit 3b8fe0f8e907c0ba9f7c7935e950f3e1538d427f
which moves global state into spi_master data.

A good side-effect of the change is: init function becomes easier
to read.

Tested: ninja test

Change-Id: I04f55f77bb4703f1d88b2191c45a22be3c97bf87
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/54748
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
1 file changed