Resolve merge conflict for diverging branch.

Explicitely convert from goffset to gsize with prior overflow
check. Implicit conversion is forbidden by compiler settings.

src/stlink-gui/gui.c

@@ -303,7 +303,7 @@ static gpointer stlink_gui_populate_filemem_view(gpointer data) {
 
 	goffset file_size = g_file_info_get_size(file_info);
 
-	if (G_MAXSIZE < file_size) {
+	if ((0 > file_size) && (G_MAXSIZE <= file_size)) {
 	  stlink_gui_set_info_error_message(gui, "File too large.");
 	  goto out_input;
 	}