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tcp113: fix null list in concatenation error

--- a/rc/bin/service/tcp113

+++ b/rc/bin/service/tcp113

@@ -1,4 +1,4 @@

 #!/bin/rc

 x=`{read|sed 's/
//'}

 y=`{echo -n $x | sed 's/ //g'}

-echo $y^:USERID:UNIX:none

+echo $"y^:USERID:UNIX:none