[patch, libfortran] PR38504 double minus sign when printing integer

[Jerry DeLisle]

This patch is self explanatory and fixes the problem by checking for a '-' given 
by gfc_itoa.

Regression tested on x86-64.

I will commit under obvious and simple rule.

Regards,

Jerry

2008-12-13  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libfortran/38504
	io/write.c (write_decimal): Skip extra sign '-' at beginning of string
	returned by gfc_itoa.
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