two patches for voicecall.c

[Li, Minjun]

Hi Folks,
I have made 2 patches for minor bugs in functions of voicecall_busy and dial_callback in /src/voicecall.c.
The first one is to use the function pointer set_udub to replace release_specific.
The second one is to delete the repeated calling of voicecall_create in dial_callback function, since it was called in previous line in the same function.

Best Regards,
Minjun

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