package/zram: fix up Kconfig behaviour for kernel 6.12

The initial 6.12 merge leaves package/zram menuconfig behaviour confusing.
Selecting "kmod-zram" opens a submenu of the available algorithms to build
and the actual algo to use. However, when "lzo-rle" is shown as the default
used, it still remains missing from the available list. Only enabling a
_different_ compression algo to build will also reveal "lzo-rle" as
available.

Update the Kconfig to show "lzo-rle" as available if used/referenced.

Fixes: 4708057e27 ("package/zram: update for kernel 6.12")
Signed-off-by: Tony Ambardar <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18712
Signed-off-by: Hauke Mehrtens <[email protected]>

package/kernel/linux/modules/other.mk

@@ -714,10 +714,7 @@ define KernelPackage/zram/config
   if PACKAGE_kmod-zram
     if !LINUX_6_6
         config KERNEL_ZRAM_BACKEND_LZO
-                bool "lzo and lzo-rle compression support" if KERNEL_ZRAM_BACKEND_LZ4 || \
-                    KERNEL_ZRAM_BACKEND_LZ4HC || KERNEL_ZRAM_BACKEND_ZSTD
-                default !KERNEL_ZRAM_BACKEND_LZ4 && \
-                    !KERNEL_ZRAM_BACKEND_LZ4HC && !KERNEL_ZRAM_BACKEND_ZSTD
+                bool "lzo and lzo-rle compression support"
 
         config KERNEL_ZRAM_BACKEND_LZ4
                 bool "lz4 compression support"
@@ -728,6 +725,12 @@ define KernelPackage/zram/config
         config KERNEL_ZRAM_BACKEND_ZSTD
                 bool "zstd compression support"
 
+        config KERNEL_ZRAM_BACKEND_FORCE_LZO
+                def_bool !KERNEL_ZRAM_BACKEND_LZ4 && \
+                         !KERNEL_ZRAM_BACKEND_LZ4HC && \
+                         !KERNEL_ZRAM_BACKEND_ZSTD
+                select KERNEL_ZRAM_BACKEND_LZO
+
     endif
     choice
       prompt "ZRAM Default compressor"