vala: Avoid critical in SourceFile.get_mapped_length()

See https://gitlab.gnome.org/GNOME/vala/issues/1330

diff --git a/vala/valasourcefile.vala b/vala/valasourcefile.vala
index 9d8808038aec2c31be133d502ceb92a40a6d7bc3..8f4175cdef7d1ecb4932d5b505b9de958a5b2218 100644 (file)
--- a/vala/valasourcefile.vala
+++ b/vala/valasourcefile.vala
@@ -362,6 +362,10 @@ public class Vala.SourceFile {
                        return content.length;
                }
 
+               if (mapped_file == null) {
+                       return 0;
+               }
+
                return mapped_file.get_length ();
        }