patch 8.2.0063: wrong size argument to vim_snprintf()

Problem:    Wrong size argument to vim_snprintf(). (Dominique Pelle)
Solution:   Reduce the size by the length. (related to #5410)

Author: brammool

src/ops.c

@@ -3813,8 +3813,12 @@ cursor_pos_info(dict_T *dict)
 
 	bom_count = bomb_size();
 	if (dict == NULL && bom_count > 0)
-	    vim_snprintf((char *)IObuff + STRLEN(IObuff), IOSIZE,
+	{
+	    size_t len = STRLEN(IObuff);
+
+	    vim_snprintf((char *)IObuff + len, IOSIZE - len,
 				 _("(+%lld for BOM)"), (long_long_T)bom_count);
+	}
 	if (dict == NULL)
 	{
 	    // Don't shorten this message, the user asked for it.

src/version.c

@@ -742,6 +742,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    63,
 /**/
     62,
 /**/