Linux: Assert mutex is held in mutex_exit()

A spurious mutex_exit() in a development branch caused weird issues
until I identified it. An assertion prior to mutex_exit() would have
caught it. Rather than adding assertions before invocations of
mutex_exit() in the code, let us simply add an assertion to
mutex_exit(). It is cheap and will likely improve developer
productivity.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by: Richard Yao <richard.yao@klarasystems.com>
Sponsored-By: Wasabi Technology, Inc.
Closes #14541

include/os/linux/spl/sys/mutex.h

@@ -171,6 +171,7 @@ spl_mutex_lockdep_on_maybe(kmutex_t *mp)			\
  */
 #define	mutex_exit(mp)						\
 {								\
+	ASSERT3P(mutex_owner(mp), ==, current);			\
 	spl_mutex_clear_owner(mp);				\
 	spin_lock(&(mp)->m_lock);				\
 	spl_mutex_lockdep_off_maybe(mp);			\