patch 8.2.2557: compiler warning for shadowd variable

Problem:    Compiler warning for shadowd variable.
Solution:   Declare "p" only once.
diff --git a/src/version.c b/src/version.c
index d6065b7..8eead06 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2557,
+/**/
     2556,
 /**/
     2555,