Staging: sxg: Removed unnecessary checks while taking Transmit Locks

Fix the locking issue of locks in transmit code path.
There was an unnecessary check for interrupt context in transmit code path.
Removed that.

Signed-off-by: LinSysSoft Sahara Team <saharaproj@linsyssoft.com>
Signed-off-by: Mithlesh Thukral <mithlesh@linsyssoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>