[RFC PATCH 10/23] ALSA: usb/line6: remove 'defined but not used' warning

[Pierre-Louis Bossart]

Fix W=1 warning. Variables are declared in a header file included from
multiple C files. Mark as __maybe_unused.

sound/usb/line6/driver.h:70:18: warning: ‘SYSEX_EXTRA_SIZE’ defined
but not used [-Wunused-const-variable=]
   70 | static const int SYSEX_EXTRA_SIZE = sizeof(line6_midi_id) + 4;
      |                  ^~~~~~~~~~~~~~~~
sound/usb/line6/driver.h:69:18: warning: ‘SYSEX_DATA_OFS’ defined but
   not used [-Wunused-const-variable=]
   69 | static const int SYSEX_DATA_OFS = sizeof(line6_midi_id) + 3;
      |                  ^~~~~~~~~~~~~~

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/usb/line6/driver.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/usb/line6/driver.h b/sound/usb/line6/driver.h
index 1a4e3700c80c..3f75855f142a 100644
--- a/sound/usb/line6/driver.h
+++ b/sound/usb/line6/driver.h
@@ -66,8 +66,8 @@
 
 extern const unsigned char line6_midi_id[3];
 
-static const int SYSEX_DATA_OFS = sizeof(line6_midi_id) + 3;
-static const int SYSEX_EXTRA_SIZE = sizeof(line6_midi_id) + 4;
+static __maybe_unused const int SYSEX_DATA_OFS = sizeof(line6_midi_id) + 3;
+static __maybe_unused const int SYSEX_EXTRA_SIZE = sizeof(line6_midi_id) + 4;
 
 /*
 	 Common properties of Line 6 devices.
-- 
2.25.1