ifup-wireless: remove unneeded pipes

Signed-off-by: Davide Madrisan <davide.madrisan@gmail.com>

etc/sysconfig/network-scripts/ifup-wireless

@@ -38,18 +38,16 @@ if [ "$WIRELESS_ESSID" ]; then
          ifconfig ${DEVICE} up
          iwlist ${DEVICE} scan essid $WIRELESS_ESSID > $tmpfile; }
 
-      cat $tmpfile | \
       while read line; do
          if [ "${line:0:5}" = "Cell " ]; then
             [ "$found_essid" ] && break || > $tmpfile1
          fi
          echo $line >> $tmpfile1
          [ "$line" = "ESSID:\"$WIRELESS_ESSID\"" ] && found_essid=1
-      done
+      done < $tmpfile
 
       > $tmpfile
 
-      cat $tmpfile1 | \
       while read line; do
          vname=${line/:*}
          if [ "${line:0:4}" = "Cell" ]; then
@@ -79,7 +77,7 @@ if [ "$WIRELESS_ESSID" ]; then
               "$vname" = "WIRELESS_AUTO_Authentication_Suites" ]; then
             echo $vname=$vval >> $tmpfile
          fi
-      done
+      done < $tmpfile1
 
       . $tmpfile
    else