dt: make setprop argument static

Whatever we pass in to qemu_devtree_setprop to put into the device tree
will not get modified by that function, so it can easily be declared const.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@petalogix.com>

device_tree.c

@@ -127,7 +127,7 @@ static int findnode_nofail(void *fdt, const char *node_path)
 }
 
 int qemu_devtree_setprop(void *fdt, const char *node_path,
-                         const char *property, void *val_array, int size)
+                         const char *property, const void *val_array, int size)
 {
     int r;
 

device_tree.h

@@ -18,7 +18,7 @@ void *create_device_tree(int *sizep);
 void *load_device_tree(const char *filename_path, int *sizep);
 
 int qemu_devtree_setprop(void *fdt, const char *node_path,
-                         const char *property, void *val_array, int size);
+                         const char *property, const void *val_array, int size);
 int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
                               const char *property, uint32_t val);
 int qemu_devtree_setprop_u64(void *fdt, const char *node_path,