brcm2708: simplify gzip image generation

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 47558

target/linux/brcm2708/image/Makefile

@@ -11,16 +11,6 @@ include $(INCLUDE_DIR)/host.mk
 FAT32_BLOCK_SIZE=1024
 FAT32_BLOCKS=$(shell echo $$(($(CONFIG_BRCM2708_SD_BOOT_PARTSIZE)*1024*1024/$(FAT32_BLOCK_SIZE))))
 
-ifneq ($(CONFIG_TARGET_IMAGES_GZIP),)
-  define Image/gzip
-    gzip -9n -c $(1) > $(1).gz
-    mv $(1).gz $(BIN_DIR)
-  endef
-else
-  define Image/gzip
-  endef
-endif
-
 ### Image scripts ###
 define Build/gen-cfg
 	cat config.txt > $@.config
@@ -49,7 +39,7 @@ endef
 define Build/sdcard-img
 	./gen_rpi_sdcard_img.sh $@ $@.boot $(word 2,$^) \
 		$(CONFIG_BRCM2708_SD_BOOT_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
-	$(call Image/gzip,$@)
+	$(if $(CONFIG_TARGET_IMAGES_GZIP),gzip -9n -c $@ > $(BIN_DIR)/$(notdir $@).gz)
 endef
 
 ### Device macros ###