[source] image.mk: force kernel rebuild on every run

[LEDE Commits]

nbd pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/53fcaed1f78a4fa4073c96801e4a365e61866e62

commit 53fcaed1f78a4fa4073c96801e4a365e61866e62
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon Mar 13 10:49:58 2017 +0100

    image.mk: force kernel rebuild on every run
    
    DTS dependencies are not processed correctly so makes it safer against
    poentially stale builds
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 include/image.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/image.mk b/include/image.mk
index 81519cd..8f55627 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -420,7 +420,7 @@ define Device/Build/initramfs
   $(BIN_DIR)/$$(KERNEL_INITRAMFS_IMAGE): $(KDIR)/tmp/$$(KERNEL_INITRAMFS_IMAGE)
 	cp $$^ $$@
 
-  $(KDIR)/tmp/$$(KERNEL_INITRAMFS_IMAGE): $(KDIR)/$$(KERNEL_INITRAMFS_NAME) $(CURDIR)/Makefile $$(KERNEL_DEPENDS)
+  $(KDIR)/tmp/$$(KERNEL_INITRAMFS_IMAGE): $(KDIR)/$$(KERNEL_INITRAMFS_NAME) $(CURDIR)/Makefile $$(KERNEL_DEPENDS) image_prepare
 	@rm -f $$@
 	$$(call concat_cmd,$$(KERNEL_INITRAMFS))
 endef
@@ -444,7 +444,7 @@ define Device/Build/kernel
     ifdef CONFIG_IB
       install: $$(KDIR_KERNEL_IMAGE)
     endif
-    $$(KDIR_KERNEL_IMAGE): $(KDIR)/$$(KERNEL_NAME) $(CURDIR)/Makefile $$(KERNEL_DEPENDS)
+    $$(KDIR_KERNEL_IMAGE): $(KDIR)/$$(KERNEL_NAME) $(CURDIR)/Makefile $$(KERNEL_DEPENDS) image_prepare
 	@rm -f $$@
 	$$(call concat_cmd,$$(KERNEL))
 	$$(if $$(KERNEL_SIZE),$$(call Build/check-size,$$(KERNEL_SIZE)))