bug#30822: 25.3; python-shell-send-defun sends only one line

[Nitish]

As Noam Postavsky mentioned, there was an unconditional (forward-line 1) 
expression.

The issue manifests itself in a different way too. In the example that David 
Liu gave, add a decorator to the function on the first line. Then 
`python-shell-send-defun` enters an infinite loop.

The attached patch fixes both these issues. `(forward-line 1)` should be called 
only when `(forward-line -1)` moves Point and `(looking-at..` returns false.

0001-30822-Fixed-infinite-loop-and-also-removed-an-extra-.patch
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