[LTP] [PATCH] Fix small issue on ftrace_regression01.sh testcase

[Wang Long]

add the forgotten `$`.

Signed-off-by: Wang Long <w@laoqinren.net>
---
 testcases/kernel/tracing/ftrace_test/ftrace_regression01.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/kernel/tracing/ftrace_test/ftrace_regression01.sh b/testcases/kernel/tracing/ftrace_test/ftrace_regression01.sh
index f90e83a..d6969cf 100755
--- a/testcases/kernel/tracing/ftrace_test/ftrace_regression01.sh
+++ b/testcases/kernel/tracing/ftrace_test/ftrace_regression01.sh
@@ -64,7 +64,7 @@ ftrace_userstacktrace_test()
 			exc_page_fault_enable=`cat $EXC_PAGE_FAULT_ENABLE`
 			echo 1 > $EXC_PAGE_FAULT_ENABLE
 		else
-			mm_page_fault_enable=`cat MM_PAGE_FAULT_ENABLE`
+			mm_page_fault_enable=`cat $MM_PAGE_FAULT_ENABLE`
 			echo 1 > $MM_PAGE_FAULT_ENABLE
 		fi
 	done
-- 
1.8.3.1