tree/: Make send_command callbacks const correct

BUG=b:170189476
BRANCH=none
TEST=builds

Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Change-Id: I97adfc4176bea731330ba8b25ed7e0c41ff60149
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/2467157
Tested-by: Edward O'Callaghan <quasisec@chromium.org>
Auto-Submit: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Edward O'Callaghan <quasisec@chromium.org>
diff --git a/ch341a_spi.c b/ch341a_spi.c
index d3af32f..17c37eb 100644
--- a/ch341a_spi.c
+++ b/ch341a_spi.c
@@ -335,7 +335,7 @@
 	stored_delay_us += usecs;
 }
 
-static int ch341a_spi_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr)
+static int ch341a_spi_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr)
 {
 	if (handle == NULL)
 		return -1;
diff --git a/digilent_spi.c b/digilent_spi.c
index 13a876e..0f7a9da 100644
--- a/digilent_spi.c
+++ b/digilent_spi.c
@@ -257,7 +257,7 @@
 	return 0;
 }
 
-static int digilent_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int digilent_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 				     const unsigned char *writearr, unsigned char *readarr)
 {
 	int ret;
diff --git a/jlink_spi.c b/jlink_spi.c
index 8a69b41..36611bf 100644
--- a/jlink_spi.c
+++ b/jlink_spi.c
@@ -101,7 +101,7 @@
 	return true;
 }
 
-static int jlink_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int jlink_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 		const unsigned char *writearr, unsigned char *readarr)
 {
 	uint32_t length;
diff --git a/mstarddc_spi.c b/mstarddc_spi.c
index db11157..48d6204 100644
--- a/mstarddc_spi.c
+++ b/mstarddc_spi.c
@@ -153,7 +153,7 @@
 }
 
 /* Returns 0 upon success, a negative number upon errors. */
-static int mstarddc_spi_send_command(struct flashctx *flash,
+static int mstarddc_spi_send_command(const struct flashctx *flash,
 				     unsigned int writecnt,
 				     unsigned int readcnt,
 				     const unsigned char *writearr,
diff --git a/pickit2_spi.c b/pickit2_spi.c
index 2936ee8..0bc17af 100644
--- a/pickit2_spi.c
+++ b/pickit2_spi.c
@@ -195,7 +195,7 @@
 	return 0;
 }
 
-static int pickit2_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int pickit2_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 				     const unsigned char *writearr, unsigned char *readarr)
 {
 
diff --git a/usbblaster_spi.c b/usbblaster_spi.c
index fb1eba5..58a8a0e 100644
--- a/usbblaster_spi.c
+++ b/usbblaster_spi.c
@@ -179,7 +179,7 @@
 }
 
 /* Returns 0 upon success, a negative number upon errors. */
-static int usbblaster_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int usbblaster_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 				       const unsigned char *writearr, unsigned char *readarr)
 {
 	uint8_t cmd;