Christian Schwarz 20ea8540a6 dsl_bookmark_create_check: fix NULL pointer deref if dbca_errors == NULL
Discovered in preparation of zcp support for creating bookmarks.
Handle the case where dbca_errors is NULL.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Christian Schwarz <me@cschwarz.com>
Closes #9880
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