[patch, fortran] Fix PR 50627

[Thomas Koenig]

Hello world,

the attached patch fixes the regression regarding freeing
namespaces twice.

The test cases where also run unter valgrind without
producing errors.

Regression-tested.  OK for trunk?

	Thomas

2013-01-27  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/56054
         * decl.c (gfc_match_end):  Remove half-ready namespace
         from parent if the end of a block is missing.
         * parse.c (parse_module):  Do not put namespace into
         gsymbol on error.

2013-01-27  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/56054
         * gfortran.dg/block_12.f90:  New test.
         * gfortran.dg/module_error_1.f90:  New test.

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