MythMusic: fix Coverity ID 1026182 Use after free
MythMusic: fix Coverity ID 1026178 Uninitialized pointer field
MythMusicVolumeDialog: fix Coverity ID 1026179 Uninitialized pointer field
MythCommon: Move some code to where it should be

Fixes Coverity ID 1026181 Structurally dead code (genuine bug).
DecoderIOFactoryShoutCast: fix Coverity ID 1026180 Uninitialized scalar field
StreamView: fix Coverity ID 1026167, 1026168 Dereference null return value
StreamView: fix Coverity ID 1026165 Dereference after null check
Merge remote-tracking branch 'upstream/master'
Initialize chanid in mythtranscode

Static analysis (scan-build) detects that the variable
chanid could be used without initialization.  This is
actually a false positive, since the use is protected
by the found_chanid variable, but initializing the
variable should be benign, and eliminates that static
analysis detected issue.