loaders: fix open_ih return value checks

open_ih() returns -1 on error and 0 is a valid return value.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@839 f158a5a8-5612-0410-a976-696ce0be7e32

libopenbios/forth_load.c

@@ -33,8 +33,9 @@ int forth_load(ihandle_t dev)
     feval("0 state-valid !");
 
     fd = open_ih(dev);
-    if (!fd)
+    if (fd == -1) {
 	goto out;
+    }
 
     if (read_io(fd, magic, 2) != 2) {
 	debug("Can't read magic header\n");