[Qemu-trivial] [PATCH] device_tree: load_device_tree(): Allow NULL sizep

["Peter A. G. Crosthwaite" <peter.crosthwaite@petalogix.com>]

The sizep arg is populated with the size of the loaded device tree. Since this
is one of those informational "please populate" type arguments it should be
optional. Guarded writes to *sizep against NULL accordingly.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Acked-by: Alexander Graf <agraf@suse.de>
---
 device_tree.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/device_tree.c b/device_tree.c
index d7a9b6b..641a48a 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -71,7 +71,9 @@ void *load_device_tree(const char *filename_path, int *sizep)
     int ret;
     void *fdt = NULL;
 
-    *sizep = 0;
+    if (sizep) {
+        *sizep = 0;
+    }
     dt_size = get_image_size(filename_path);
     if (dt_size < 0) {
         printf("Unable to get size of device tree file '%s'\n",
@@ -104,7 +106,9 @@ void *load_device_tree(const char *filename_path, int *sizep)
             filename_path);
         goto fail;
     }
-    *sizep = dt_size;
+    if (sizep) {
+        *sizep = dt_size;
+    }
     return fdt;
 
 fail:
-- 
1.7.0.4