patch 8.0.0577: warning for uninitialized variable

Problem:    Warning for uninitialized variable. (John Marriott)
Solution:   Initialize "indent".
diff --git a/src/misc1.c b/src/misc1.c
index 1a220e1..bc927b1 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -9251,7 +9251,7 @@
     int
 get_expr_indent(void)
 {
-    int		indent;
+    int		indent = -1;
     char_u	*inde_copy;
     pos_T	save_pos;
     colnr_T	save_curswant;