Set print symbol off in mi-var-display.exp

Hi,
I see the following fail on arm-none-eabi target,

-var-evaluate-expression -f nat foo^M
^done,value="0x3 <_ftext+2>"^M
(gdb) ^M
FAIL: gdb.mi/mi-var-display.exp: eval variable -f nat foo

the "<_ftext+2>" isn't expected in the test, so "set print symbol off"
can prevent printing it.  It is obvious and I'll commit it in three
days if no comments.

gdb/testsuite:

2014-09-09  Yao Qi  <yao@codesourcery.com>

	* gdb.mi/mi-var-display.exp: Set print symbol off.

gdb/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2014-09-09  Yao Qi  <yao@codesourcery.com>
+
+	* gdb.mi/mi-var-display.exp: Set print symbol off.
+
 2014-09-07  Gabriel Krisman Bertazi  <gabriel@krisman.be>
 
 	PR gdb/17035

gdb/testsuite/gdb.mi/mi-var-display.exp

@@ -49,6 +49,9 @@ mi_run_cmd
 mi_expect_stop "breakpoint-hit" "do_children_tests" "" ".*var-cmd.c" \
 	$line_dct_end { "" "disp=\"keep\"" } "run to main"
 
+# Prevent symbol on the address being printed.
+mi_gdb_test "-gdb-set print symbol off"
+
 #####       #####
 #               #
 # Display tests #