[gimp] fix parser for plugin image types

[Simon Budig <simon src gnome org>]

commit 56fa168ec3e7db33b2dac15cdc018daa2eb1820f
Author: Simon Budig <simon budig de>
Date:   Fri Aug 15 23:07:48 2014 +0200

    fix parser for plugin image types
    
    Spotted by Andrey Karpov using static code analysis:
       http://www.viva64.com/en/b/0273/

 app/plug-in/gimppluginprocedure.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/app/plug-in/gimppluginprocedure.c b/app/plug-in/gimppluginprocedure.c
index fa8574f..917742b 100644
--- a/app/plug-in/gimppluginprocedure.c
+++ b/app/plug-in/gimppluginprocedure.c
@@ -804,10 +804,11 @@ image_types_parse (const gchar *name,
               g_printerr ("%s: image-type contains unrecognizable parts:"
                           "'%s'\n", name, type_spec);
 
+              /* skip to next token */
               while (*image_types &&
-                     ((*image_types != ' ') ||
-                      (*image_types != '\t') ||
-                      (*image_types != ',')))
+                     *image_types != ' '  &&
+                     *image_types != '\t' &&
+                     *image_types != ',')
                 {
                   image_types++;
                 }