[vala/0.36] ccode: Fix typo and actually check "end_decls"

[Rico Tzschichholz <ricotz src gnome org>]

commit f2dc2490a45fab73948e71b582201aa1d8458850
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Oct 9 08:28:33 2018 +0200

    ccode: Fix typo and actually check "end_decls"
    
    Note both begin_decls and end_decls must be either not null or null.
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/672

 ccode/valaccodefile.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/ccode/valaccodefile.vala b/ccode/valaccodefile.vala
index 128cd3938..2371622dd 100644
--- a/ccode/valaccodefile.vala
+++ b/ccode/valaccodefile.vala
@@ -170,7 +170,7 @@ public class Vala.CCodeFile {
                        once.append (constant_declaration);
                        once.append (new CCodeNewline ());
 
-                       if (begin_decls != null) {
+                       if (end_decls != null) {
                                once.append (new CCodeIdentifier (end_decls));
                                once.append (new CCodeNewline ());
                        }