brcm2708: fix sdcard image

The gzip step in the sdcard image build fails because the image filename
already has the gzip extension. This results in an empty image file, to
which the metadata is finally appended.

Remove the .gz extension from the image filename to fix this.

Fixes: e79b096ee1 ("brcm2708: convert to metadata")

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

target/linux/brcm2708/image/Makefile

@@ -50,8 +50,8 @@ define Device/Default
   FILESYSTEMS := ext4
   KERNEL := kernel-bin | kernel-img
   KERNEL_IMG := kernel.img
-  IMAGES := sdcard.img.gz
-  IMAGE/sdcard.img.gz := boot-img | sdcard-img | gzip | append-metadata
+  IMAGES := sdcard.img
+  IMAGE/sdcard.img := boot-img | sdcard-img | gzip | append-metadata
 endef
 
 define Device/rpi