tipc: use double brackets in if conditions

Author: Richard Alpe

completions/tipc

@@ -23,7 +23,7 @@ _tipc_bearer() {
     fi
 
     for ((i = 0; i < $cword; i++)); do
-        if [ ${words[$i]} == 'media' ]; then
+        if [[ ${words[$i]} == 'media' ]]; then
             media=${words[$(($i + 1))]}
         fi
     done
@@ -102,7 +102,7 @@ _tipc()
             fi
 
             for ((i = 0; i < $cword; i++)); do
-                if [ ${words[$i]} == 'media' ]; then
+                if [[ ${words[$i]} == 'media' ]]; then
                     media=${words[$(($i + 1))]}
                 fi
             done