tracing: Fix return value of tracing_stats_read()

The function tracing_stats_read() mistakenly returns ENOMEM instead
of the negative value -ENOMEM.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
LKML-Reference: <4AFB2C0B.50605@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

kernel/trace/trace.c

@@ -3730,7 +3730,7 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
 
 	s = kmalloc(sizeof(*s), GFP_KERNEL);
 	if (!s)
-		return ENOMEM;
+		return -ENOMEM;
 
 	trace_seq_init(s);