fix null dereference.

initial patch from me, reworked by oga@.

found by LLVM/Clang Static Analyzer.

ok oga@

diff --git a/sys/dev/pci/drm/drm_memory.c b/sys/dev/pci/drm/drm_memory.c
index 81dc4a1..a1eba52 100644 (file)
--- a/sys/dev/pci/drm/drm_memory.c
+++ b/sys/dev/pci/drm/drm_memory.c
@@ -136,7 +136,10 @@ done:
 void
 drm_ioremapfree(drm_local_map_t *map)
 {
-       if (map != NULL && map->bsr != NULL)
+       if (map == NULL)
+               return;
+
+       if (map->bsr != NULL)
                vga_pci_bar_unmap(map->bsr);
        else
                bus_space_unmap(map->bst, map->bsh, map->size);