Is this correct? It implies, I think, that you have left the 14->16 patch file somewhere it shouldn't be when you did the diff.
diff -Naur drupal-6.14/drupal-6.14-to-6.16.patch drupal-6.17/drupal-6.14-to-6.16.patch
--- drupal-6.14/drupal-6.14-to-6.16.patch 2010-03-04 09:22:40.000000000 +0100
+++ drupal-6.17/drupal-6.14-to-6.16.patch 1970-01-01 01:00:00.000000000 +0100
Patch complains it's going to remove it, declaring at the same time it doesn't exist!
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