Memory Safety: Medium
spa_bt_midi_server_new() did not check the return value of strdup()
when duplicating the characteristic path. On allocation failure, a
NULL chr_path would be returned as part of the server object,
leading to a NULL pointer dereference when later used. Add a NULL
check that jumps to the existing fail cleanup path.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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