profiles/features/dist-kernel/bashrc: Preserve /boot files for same slot

After a new kernel and initramfs for the same kernel version have been
built, the old kernel and initramfs are still useful as a fail-safe
option if the new kernel lacks any necessary in-kernel configuration
options and cannot boot with the new initramfs as a result.

Signed-off-by: Yuan Liao <liaoyuan@gmail.com>

profiles/features/dist-kernel/bashrc/dist-kernel.sh

@@ -34,20 +34,20 @@ if has kernel-install ${INHERITED}; then
 			fi
 		fi
 
-		local to_rm=()
-		local file
-		for file in \
-			"${EROOT}/boot/"{config,System.map,vmlinuz}"-${KV_REL}"{,.old} \
-			"${EROOT}/boot/initramfs-${KV_REL}.img"{,.old}; do
-			[[ -e ${file} ]] && to_rm+=( "${file}" )
-		done
-		if [[ ${#to_rm[@]} != 0 ]]; then
-			ebegin "Removing kernel files under /boot"
-			rm "${to_rm[@]}"
-			eend $?
-		fi
-
 		if [[ -z ${REPLACED_BY_VERSION} ]]; then
+			local to_rm=()
+			local file
+			for file in \
+				"${EROOT}/boot/"{config,System.map,vmlinuz}"-${KV_REL}"{,.old} \
+				"${EROOT}/boot/initramfs-${KV_REL}.img"{,.old}; do
+				[[ -e ${file} ]] && to_rm+=( "${file}" )
+			done
+			if [[ ${#to_rm[@]} != 0 ]]; then
+				ebegin "Removing kernel files under /boot"
+				rm "${to_rm[@]}"
+				eend $?
+			fi
+
 			ebegin "Updating bootloader configuration"
 			"${EROOT}/etc/kernel/postinst.d/91-grub-mkconfig.install"
 			eend $?