GDB script mode font-lock bug?

[Nick Roberts]

The keyword end associated with document is incorrectly fontified.
e.g with:

# Set up something to print out s-expressions.
define pr
  set debug_print ($)
end
document pr
Print the emacs s-expression which is $.
Works only when an inferior emacs is executing.
end

The first end has font-lock-keyword-face, but the second end has
font-lock-doc-face.

Nick