Fix PLL logic broken in the last commit. Only apply phase diff signal if it's non-zero, otherwise we are introducing some unwanted frequency movements when it shall remain stable, i.e. when there is no error.
Fix PLL logic broken in the last commit. Only apply phase diff
signal if it's non-zero, otherwise we are introducing some unwanted
frequency movements when it shall remain stable, i.e. when there
is no error.

jevonearth/rtpproxy,hongbinz/rtpproxy,synety-jdebp/rtpproxy,dsanders11/rtpproxy,hongbinz/rtpproxy,Vocalocity/rtpproxy-pre,synety-jdebp/rtpproxy,synety-jdebp/rtpproxy,synety-jdebp/rtpproxy,sippy/rtpproxy,jevonearth/rtpproxy,jevonearth/rtpproxy,sippy/rtpproxy,Vocalocity/rtpproxy-pre,jevonearth/rtpproxy,dsanders11/rtpproxy,hongbinz/rtpproxy,Vocalocity/rtpproxy-pre,dsanders11/rtpproxy,hongbinz/rtpproxy,Vocalocity/rtpproxy-pre,sippy/rtpproxy