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cf4a9d7241
1. ptmx_open -> pty_register2 -> master register i_crefs 1
-> salve register i_crefs 1
2. ptmx_open -> master unregister i_crefs 0
3. master open i_crefs 1
salve open i_crefs 2
4. in pty_close() master close with i_crefs 1
salve close with i_crefs 2
So, if correct the i_crefs judgement in pty_close()
Signed-off-by: ligd <liguiding1@xiaomi.com>
Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>