patch 8.0.0577: warning for uninitialized variable

Problem:    Warning for uninitialized variable. (John Marriott)
Solution:   Initialize "indent".

src/misc1.c

@@ -9251,7 +9251,7 @@ find_match(int lookfor, linenr_T ourscope)
     int
 get_expr_indent(void)
 {
-    int		indent;
+    int		indent = -1;
     char_u	*inde_copy;
     pos_T	save_pos;
     colnr_T	save_curswant;

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    577,
 /**/
     576,
 /**/