usb: net: sierra: check for no status endpoint

[ Upstream commit 4c4ca3c46167518f8534ed70f6e3b4bf86c4d158 ]

The driver checks for having three endpoints and
having bulk in and out endpoints, but not that
the third endpoint is interrupt input.
Rectify the omission.

Reported-by:  <syzbot+3f89ec3d1d0842e95d50@syzkaller.appspotmail.com>
Closes: https://lore.kernel.org/linux-usb/686d5a9f.050a0220.1ffab7.0017.GAE@google.com/


Tested-by:  <syzbot+3f89ec3d1d0842e95d50@syzkaller.appspotmail.com>
Fixes: eb4fd8cd ("net/usb: add sierra_net.c driver")
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Link: https://patch.msgid.link/20250714111326.258378-1-oneukum@suse.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>