tipc: fix missing last char in link name completion

In this commit we fix a but where the last character of a tab
completed link name where missing.

Example of behaviour prior to this commit:
$ tipc link get priority link <TAB>
1.1.2:eth3-1.1.1:eth  broadcast-lin

Author: Richard Alpe

completions/tipc

@@ -64,7 +64,7 @@ _tipc_link() {
     elif [[ $cword -eq $optind+1 ]]; then
         # awk drops link state and last trailing :
         local links=$(tipc link list 2>/dev/null | \
-                      awk '{print substr($1, 0, length($1)-1)}')
+                      awk '{print substr($1, 0, length($1))}')
         if [[ $filter == "peers" ]]; then
             links=$(command sed '/broadcast-link/d' <<<"$links")
         fi