patch 8.2.2856: get readonly error for device that can't be written to

Problem:    Get readonly error for device that can't be written to.
Solution:   Check for being able to write first. (closes #8205)
diff --git a/src/version.c b/src/version.c
index 1aef3c7..70e02ed 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2856,
+/**/
     2855,
 /**/
     2854,