Fix building with GCC 4.9

It doesn't like empty initializers.

Change-Id: If2988e60401155f87ee3369c77f00ccf9332012c
Signed-off-by: Evgeny Zinoviev <me@ch1p.io>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/36629
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/usbblaster_spi.c b/usbblaster_spi.c
index d6b5084..e2a0a4f 100644
--- a/usbblaster_spi.c
+++ b/usbblaster_spi.c
@@ -48,7 +48,7 @@
 const struct dev_entry devs_usbblasterspi[] = {
 	{ALTERA_VID, ALTERA_USBBLASTER_PID, OK, "Altera", "USB-Blaster"},
 
-	{}
+	{0}
 };
 
 static const struct spi_master spi_master_usbblaster;