The PChannel id is a 32bit, potentially random identifier and not an
array index.
Fixes also the handling of channel group "dwGroup" 0. As it is invalid
it is used to mark uninitialized PChannels.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=17766
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=24740
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=31562Signed-off-by: Michael Stefaniuc <mstefani@winehq.org>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>