[vala/0.40] sqlite3: Fix use of possibly unassigned parameter `errmsg'

[Rico Tzschichholz <ricotz src gnome org>]

commit e47677b8cb4ca2981a0ed64adedac90b7ba53770
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Sep 16 10:46:17 2019 +0200

    sqlite3: Fix use of possibly unassigned parameter `errmsg'

 vapi/sqlite3.vapi | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/vapi/sqlite3.vapi b/vapi/sqlite3.vapi
index fa65f9046..4af4e3d83 100644
--- a/vapi/sqlite3.vapi
+++ b/vapi/sqlite3.vapi
@@ -36,6 +36,8 @@ namespace Sqlite {
                        var ec = this._exec (sql, callback, out sqlite_errmsg);
                        if (&errmsg != null) {
                                errmsg = sqlite_errmsg;
+                       } else {
+                               errmsg = null;
                        }
                        Sqlite.Memory.free ((void*) sqlite_errmsg);
                        return ec;
@@ -65,6 +67,8 @@ namespace Sqlite {
 
                        if (&errmsg != null) {
                                errmsg = sqlite_errmsg;
+                       } else {
+                               errmsg = null;
                        }
                        Sqlite.Memory.free ((void*) sqlite_errmsg);
                        return ec;