basic_string.tcc (_M_mutate): Do not reallocate unnecessarily when _M_rep() == &_S_empty_rep() and __new_size...

2004-10-18  Paolo Carlini  <pcarlini@suse.de>

	* include/bits/basic_string.tcc (_M_mutate): Do not reallocate
	unnecessarily when _M_rep() == &_S_empty_rep() and __new_size
	== capacity() (== 0): is ok to just leave everything unchanged.

	* include/bits/basic_string.h: Minor formatting fixes.
	* include/bits/basic_string.tcc: Likewise.

From-SVN: r89199