Variadic functions cannot be inlined. libspl_assertf ends up being
duplicated in every file that uses it.
Fix this by moving the function into a new assert.c. Also move the
definition of aok into the new file instead of zone.c.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Closes#10538
