initramfs: fix init symlink creation

The -e test will dereference the symlink, so if there is no /bin/init,
we will constantly try to create the symlink.  So rather than error on
subsequent runs when the link exists, use the force flag to ln.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

fs/initramfs/initramfs.mk

@@ -8,7 +8,7 @@
 
 define ROOTFS_INITRAMFS_INIT_SYMLINK
 	if [ ! -e $(TARGET_DIR)/init ]; then \
-		ln -s sbin/init $(TARGET_DIR)/init; \
+		ln -sf sbin/init $(TARGET_DIR)/init; \
 	fi
 endef
 
@@ -20,4 +20,4 @@ endef
 
 ROOTFS_INITRAMFS_POST_TARGETS += linux26-rebuild-with-initramfs
 
-$(eval $(call ROOTFS_TARGET,initramfs))
+$(eval $(call ROOTFS_TARGET,initramfs))