[gimp] plug-ins: tiff_open() returns a pointer, not a boolean.

[Jehan Pagès <jehanp src gnome org>]

commit 35a0d8ddbb6d550ee740b49fc758e44e52c637ad
Author: Jehan <jehan girinstud io>
Date:   Sat Jul 23 17:41:00 2016 +0200

    plug-ins: tiff_open() returns a pointer, not a boolean.

 plug-ins/file-tiff/file-tiff-io.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plug-ins/file-tiff/file-tiff-io.c b/plug-ins/file-tiff/file-tiff-io.c
index 03df383..76159ee 100644
--- a/plug-ins/file-tiff/file-tiff-io.c
+++ b/plug-ins/file-tiff/file-tiff-io.c
@@ -94,7 +94,7 @@ tiff_open (GFile        *file,
                                                         G_FILE_CREATE_NONE,
                                                         NULL, error));
       if (! tiff_io.output)
-        return FALSE;
+        return NULL;
 
       tiff_io.stream = G_OBJECT (tiff_io.output);
     }