[PATCH v1] libtracefs: Fix the read file failure code checking

The failure error code '-1' will be treated as 'true'. Only nonzero
number has buffer data returned successfully.

Signed-off-by: Haiyue Wang <[email protected]>
---
 src/tracefs-record.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tracefs-record.c b/src/tracefs-record.c
index a2dcfc2..6abc3aa 100644
--- a/src/tracefs-record.c
+++ b/src/tracefs-record.c
@@ -550,7 +550,7 @@ static int init_splice(struct tracefs_cpu *tcpu)
 	if (ret < 0)
 		return ret;
 
-	if (tfs_str_read_file("/proc/sys/fs/pipe-max-size", &buf, false)) {
+	if (tfs_str_read_file("/proc/sys/fs/pipe-max-size", &buf, false) > 0) {
 		int size = atoi(buf);
 		fcntl(tcpu->splice_pipe[0], F_SETPIPE_SZ, &size);
 		free(buf);
-- 
2.48.1