chmake returns NULL if the channel cannot be allocated
chmake returns NULL if the channel cannot be allocated

Signed-off-by: Martin Sustrik <4dd6061be1198639e8b05ce4fd5ead7a0dcaa0f4@250bpm.com>

nirs/libmill,lsm/libmill,lsm/libmill,jimjag/mill,ebfe/libmill,sustrik/libmill,sustrik/libmill,jimjag/mill,jimjag/mill,dailypips/libmill,lsm/libmill,sustrik/libmill,ebfe/libmill,linearregression/libmill,reqshark/libmill,linearregression/libmill,reqshark/libmill,nirs/libmill,dailypips/libmill,linearregression/libmill,ebfe/libmill,reqshark/libmill,dailypips/libmill