Remove unused variable from test scripts

Several of the test scripts remove $TMPFILE, without ever having set
the TMPFILE variable. This patch fixes it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

tests/dtc-checkfails.sh

@@ -12,7 +12,7 @@ done
 
 LOG="tmp.log.$$"
 
-rm -f $TMPFILE $LOG
+rm -f $LOG
 
 verbose_run_log "$LOG" $VALGRIND "$DTC" -o /dev/null "$@"
 ret="$?"

tests/fdtget-runtest.sh

@@ -5,7 +5,7 @@
 LOG="tmp.log.$$"
 EXPECT="tmp.expect.$$"
 
-rm -f $TMPFILE $LOG
+rm -f $LOG
 
 expect="$1"
 echo "$expect" >$EXPECT

tests/fdtput-runtest.sh

@@ -11,7 +11,7 @@
 LOG="tmp.log.$$"
 EXPECT="tmp.expect.$$"
 
-rm -f $TMPFILE $LOG
+rm -f $LOG
 
 expect="$1"
 echo "$expect" >$EXPECT