usb: mtu3: mtu3_debug: Add forward declaration of 'struct ssusb_mtk'

Without it, the build system complains that it was declared inside
the parameter list.

Fixes the following W=1 kernel build warning(s):

 In file included from drivers/usb/mtu3/mtu3_trace.c:11:
 drivers/usb/mtu3/mtu3_debug.h:29:36: warning: ‘struct ssusb_mtk’ declared inside parameter list will not be visible outside of this definition or declaration
 29 | void ssusb_dev_debugfs_init(struct ssusb_mtk *ssusb);
 | ^~~~~~~~~
 drivers/usb/mtu3/mtu3_debug.h:30:35: warning: ‘struct ssusb_mtk’ declared inside parameter list will not be visible outside of this definition or declaration
 30 | void ssusb_dr_debugfs_init(struct ssusb_mtk *ssusb);
 | ^~~~~~~~~
 drivers/usb/mtu3/mtu3_debug.h:31:39: warning: ‘struct ssusb_mtk’ declared inside parameter list will not be visible outside of this definition or declaration
 31 | void ssusb_debugfs_create_root(struct ssusb_mtk *ssusb);
 | ^~~~~~~~~
 drivers/usb/mtu3/mtu3_debug.h:32:39: warning: ‘struct ssusb_mtk’ declared inside parameter list will not be visible outside of this definition or declaration
 32 | void ssusb_debugfs_remove_root(struct ssusb_mtk *ssusb);
 | ^~~~~~~~~

Cc: Chunfeng Yun <[email protected]>
Cc: [email protected]
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

0 files changed, 0 insertions, 0 deletions