[PATCH, gdb] Fix now illegal upper case gdb command in chained-calls.exp

[Thomas Preudhomme]

Hi,

3d7b173c29900879c9a5958dd6029fd36666e57c made upper case commands now
illegal. However gdb.cp/chained-calls.exp still contains one test using
P to print an expression. This patch fixes the testcase to use p
instead.

ChangeLog is as follows:

2017-02-13  Thomas Preud'homme  <thomas.preudhomme@arm.com>

         * gdb.cp/chained-calls.exp: Use p instead of P.


Committed as obvious.

Best regards,

Thomas
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