fsogsmd: properly catch error when we can't allocate a MUX channel
fsogsmd: properly catch error when we can't allocate a MUX channel

slyon/debian-libfsoframework,slyon/debian-fso-deviced,slyon/debian-fso-deviced,slyon/debian-fso-usaged,slyon/debian-fso-usaged,slyon/debian-libfsoframework