Modified velodyne_point_cloud/src/lib/rawdata.cc to address warning that last_azimuth_diff variable may be used uninitialized.  Variable is now initialized to 0 at creation.
Modified velodyne_point_cloud/src/lib/rawdata.cc to address warning
that last_azimuth_diff variable may be used uninitialized.  Variable
is now initialized to 0 at creation.

velodyne/velodyne_pointcloud/src/lib/rawdata.cc:328:57: error: ‘last_azimuth_diff’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
           azimuth_corrected_f = azimuth + (azimuth_diff * ((dsr*VLP16_DSR_TOFFSET) + (firing*VLP16_FIRING_TOFFSET)) / VLP16_BLOCK_TDURATION);

wenjiebit/velodyne,wenjiebit/velodyne,wenjiebit/velodyne