[gnome-flashback] monitor-config-migration: initialize size variable

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 44cf2dc35ed69c971fb4ce22388accd97b5ffa22
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Mar 16 16:17:24 2021 +0200

    monitor-config-migration: initialize size variable
    
    Coverity CID: #1502697

 backends/gf-monitor-config-migration.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/backends/gf-monitor-config-migration.c b/backends/gf-monitor-config-migration.c
index aec5305..b9718fa 100644
--- a/backends/gf-monitor-config-migration.c
+++ b/backends/gf-monitor-config-migration.c
@@ -638,6 +638,8 @@ load_config_file (GFile   *file,
   GMarkupParseContext *context;
 
   contents = NULL;
+  size = 0;
+
   if (!g_file_load_contents (file, NULL, &contents, &size, NULL, error))
     return FALSE;