Change in flashrom[master]: spi_master: Add shutdown function in spi_master struct

[Nico Huber (Code Review)]

Nico Huber has submitted this change. ( https://review.coreboot.org/c/flashrom/+/55932 )

Change subject: spi_master: Add shutdown function in spi_master struct
......................................................................

spi_master: Add shutdown function in spi_master struct

With this, register_spi_master can take care of register_shutdown
as well, and every spi master only needs to call register_spi_master
instead of calling both register_spi_master and register_shutdown.

Testing:
In dummyflasher, comment out free(data) in shutdown. Test fails with error:
../dummyflasher.c:949: note: block 0x55e0727a6e40 allocated here
ERROR: dummy_init_and_shutdown_test_success leaked 1 block(s)
Means, shutdown function is invoked for drivers with "old" API
(so, transitioning from old to new API is not breaking anything).

Next patches in the chain converts spi masters to use new API.

BUG=b:185191942
TEST=builds and ninja test

Change-Id: I2dc80dceca2f8204bcd0dad1f51753d7e79f1af5
Signed-off-by: Anastasia Klimchuk 
Reviewed-on: https://review.coreboot.org/c/flashrom/+/55932
Tested-by: build bot (Jenkins) 
Reviewed-by: Nico Huber 
---
M programmer.h
M spi.c
2 files changed, 8 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Nico Huber: Looks good to me, approved

diff --git a/programmer.h b/programmer.h
index 95e2cda..ec55987 100644
--- a/programmer.h
+++ b/programmer.h
@@ -356,6 +356,7 @@
    int (*read)(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
    int (*write_256)(struct flashctx *flash, const uint8_t *buf, unsigned int start, unsigned int len);
    int (*write_aai)(struct flashctx *flash, const uint8_t *buf, unsigned int start, unsigned int len);
+	int (*shutdown)(void *data);
    void *data;
 };

diff --git a/spi.c b/spi.c
index 4ac3914..f2e91c4 100644
--- a/spi.c
+++ b/spi.c
@@ -135,6 +135,13 @@
 {
    struct registered_master rmst = {0};

+	if (mst->shutdown) {
+		if (register_shutdown(mst->shutdown, data)) {
+			mst->shutdown(data); /* cleanup */
+			return 1;
+		}
+	}
+
    if (!mst->write_aai || !mst->write_256 || !mst->read || !mst->command ||
        !mst->multicommand ||
        ((mst->command == default_spi_send_command) &&