Unmap mapped buffer in sane_cancel().

ChangeLog

@@ -1,3 +1,6 @@
+2008-12-17  Julien Blache <jb@jblache.org>
+	* backend/v4l.c: unmap mapped buffer in sane_cancel().
+
 2008-12-15  Alex Belkin <abc@telekom.ru>
 	* AUTHORS, configure, configure.in, backend/Makefile.in,
 	backend/xerox_mfp.c, backend/xerox_mfp.h, doc/Makefile.in,

backend/v4l.c

@@ -1080,9 +1080,15 @@ sane_cancel (SANE_Handle handle)
 
   DBG (2, "sane_cancel\n");
   /* ??? buffer isn't checked in sane_read? */
-  if ((buffer != 0) && (s->is_mmap == SANE_FALSE))
-    free (buffer);
-  buffer = 0;
+  if (buffer)
+    {
+      if (s->is_mmap)
+	munmap (buffer, s->mbuf.size);
+      else
+	free (buffer);
+
+      buffer = NULL;
+    }
 }