Fix fd comparison in Incremental

fd==0 is theoretically possible...

diff --git a/Incremental.c b/Incremental.c
index 712f2bdb31a57361b07a5534dff7e093dad83d16..266111ae416685361250420478f2e19ece3636cd 100644 (file)
--- a/Incremental.c
+++ b/Incremental.c
@@ -727,7 +727,7 @@ static char *container2devname(char *devname)
        int fd = open(devname, O_RDONLY);
        char *mdname = NULL;
 
-       if (fd > 0) {
+       if (fd >= 0) {
                mdname = devnum2devname(fd2devnum(fd));
                close(fd);
        }