selftests/ftrace: Have reset_ftrace_filter handle multiple instances

If a probe is attached to a static function that is in multiple files with
the same name, removing it by name will remove all instances:

 # grep jump_label_unlock set_ftrace_filter
jump_label_unlock:traceoff:unlimited
jump_label_unlock:traceoff:unlimited

 # echo '!jump_label_unlock:traceoff' >> set_ftrace_filter
 # grep jump_label_unlock set_ftrace_filter
 #

But the loop in reset_ftrace_filter will try to remove multiple instances
multiple times. If this happens the second time will error and cause the
test to fail.

At each iteration of the loop, check to see if the probe being removed still
exists.

Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tools/testing/selftests/ftrace/test.d/functions

@@ -37,6 +37,9 @@ reset_ftrace_filter() { # reset all triggers in set_ftrace_filter
 	if [ "$tr" = "" ]; then
 	    continue
 	fi
+	if ! grep -q "$t" set_ftrace_filter; then
+		continue;
+	fi
 	name=`echo $t | cut -d: -f1 | cut -d' ' -f1`
 	if [ $tr = "enable_event" -o $tr = "disable_event" ]; then
 	    tr=`echo $t | cut -d: -f2-4`