Fix potential race condition in testing

The It("podman wait to pause|unpause condition"... test is
flaking every so often when a messages is sent in the second
function to a channel.  It is my believe that in between the time
the first function sends a message to the channel and before it closes
the channel the second errChan=make() has happened.  This would mean that
the fist function closes the second errChan, and then when the second
function sends a message to the second errChan, it fails and blows up with
the error you are seeing.

By creating a different variable for the second channel, we eliminate the race.

Fixes: https://github.com/containers/podman/issues/6518

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

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