patch 8.2.4794: compiler warning for not initialized variable

Problem:    Compiler warning for not initialized variable.
Solution:   Initialize the variable. (John Marriott)
diff --git a/src/indent.c b/src/indent.c
index be9dd4b..9efa527 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -1046,7 +1046,7 @@
     void
 op_reindent(oparg_T *oap, int (*how)(void))
 {
-    long	i;
+    long	i = 0;
     char_u	*l;
     int		amount;
     linenr_T	first_changed = 0;