linux-firmware: fix zst install suffix

The linux-firmware Makefile defines an 'install-zst' rule, but currently
fw_compr_suffix() return the '-zstd' suffix when FIRMWARE_COMPRESSION is
set to 'zstd' which produces:

  make: *** No rule to make target 'install-zstd'.

Return '-zst' instead to properly run 'make install-zst'.

(From OE-Core rev: cc9d972eba1f47fba206665260690ad8de99679f)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/meta/recipes-kernel/linux-firmware/linux-firmware_20250410.bb b/meta/recipes-kernel/linux-firmware/linux-firmware_20250410.bb
index f12bb2c6d3..5dd178c03e 100644
--- a/meta/recipes-kernel/linux-firmware/linux-firmware_20250410.bb
+++ b/meta/recipes-kernel/linux-firmware/linux-firmware_20250410.bb
@@ -269,6 +269,8 @@ def fw_compr_suffix(d):
     compr = d.getVar('FIRMWARE_COMPRESSION')
     if compr == '':
         return ''
+    if compr == 'zstd':
+        compr = 'zst'
     return '-' + compr
 
 do_compile() {