getgroups(): clarify code

read() return value should always be positive or -1. However,
since we cast to unsigned a little later, it's clearer
to check for non-negativity.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/fuse_lowlevel.c b/lib/fuse_lowlevel.c
index c3724a6..c1c573f 100644
--- a/lib/fuse_lowlevel.c
+++ b/lib/fuse_lowlevel.c
@@ -2935,7 +2935,7 @@ retry:
 
 	ret = read(fd, buf, bufsize);
 	close(fd);
-	if (ret == -1) {
+	if (ret < 0) {
 		ret = -EIO;
 		goto out_free;
 	}