Pass programmer context to programmer->init()

Change-Id: I064eb4e25c3d382e4e5bde802306698fafe5e1d0
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/72526
diff --git a/usbblaster_spi.c b/usbblaster_spi.c
index 954967e..5be423b 100644
--- a/usbblaster_spi.c
+++ b/usbblaster_spi.c
@@ -72,7 +72,7 @@
 
 
 /* Returns 0 upon success, a negative number upon errors. */
-static int usbblaster_spi_init(void)
+static int usbblaster_spi_init(struct flashprog_programmer *const prog)
 {
 	uint8_t buf[BUF_SIZE + 1] = { 0 };