selftests: firmware: Fix the request_firmware_into_buf() test for XZ format

The test uses a different firmware name, and we forgot to adapt for
the XZ compressed file tests.

https://lore.kernel.org/all/20210127154939.13288-1-tiwai@suse.de/

Fixes: 17980459 ("selftests: firmware: Add request_firmware_into_buf tests")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20220421152908.4718-4-tiwai@suse.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/testing/selftests/firmware/fw_filesystem.sh

@@ -504,6 +504,7 @@ test "$HAS_FW_LOADER_COMPRESS" != "yes" && exit 0
 
 # test with both files present
 $RUN_XZ -k $FW
+$RUN_XZ -k $FW_INTO_BUF
 config_set_name $NAME
 echo
 echo "Testing with both plain and xz files present..."
@@ -529,6 +530,7 @@ done
 
 # test with only xz file present
 mv "$FW" "${FW}-orig"
+mv "$FW_INTO_BUF" "${FW_INTO_BUF}-orig"
 echo
 echo "Testing with only xz file present..."
 for i in $(seq 1 5); do