Fix code format issues gdb.base/macscp.exp

When I do something else, I find code format in gdb.base/macscp.exp is
messy.  This patch is to fix various code format issues in it.

Pushed as it is obvious.

gdb/testsuite:

2014-03-26  Yao Qi  <yao@codesourcery.com>

	* gdb.base/macscp.exp: Fix code format issues.