bitbang_spi.c: Rename usages of bitbang_spi_master into master

There were two different things in this file, but both of them were
called "mst" and it was confusing.

Now the variables of type bitbang_spi_master are called "master",
including the member of bitbang_spi_master_data. The variables of
type spi_master are called mst.

BUG=b:185191942
TEST=builds

Change-Id: I2fdbdc2daedde7f6996642cfbb2d34ec06a89621
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/54989
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
diff --git a/bitbang_spi.c b/bitbang_spi.c
index bb89071..85c867e 100644
--- a/bitbang_spi.c
+++ b/bitbang_spi.c
@@ -95,7 +95,7 @@
 }
 
 struct bitbang_spi_master_data {
-	const struct bitbang_spi_master *mst;
+	const struct bitbang_spi_master *master;
 };
 
 static int bitbang_spi_send_command(const struct flashctx *flash,
@@ -105,7 +105,7 @@
 {
 	unsigned int i;
 	const struct bitbang_spi_master_data *data = flash->mst->spi.data;
-	const struct bitbang_spi_master *master = data->mst;
+	const struct bitbang_spi_master *master = data->master;
 
 	/* FIXME: Run bitbang_spi_request_bus here or in programmer init?
 	 * Requesting and releasing the SPI bus is handled in here to allow the
@@ -160,7 +160,7 @@
 	}
 
 	struct bitbang_spi_master_data *data = calloc(1, sizeof(struct bitbang_spi_master_data));
-	data->mst = master;
+	data->master = master;
 	mst.data = data;
 	register_spi_master(&mst, NULL);
 	register_shutdown(bitbang_spi_shutdown, data);