[patch, Fortran] Fix PR fortran/68147, temporaries for allocatable strings

[Thomas Koenig]

Hello world,

in the fix for PR 47674, there was a piece of unnecessary
code which meant that allocatable string assignments did
not get their temporary within IF statements (and others).

This patch is really simple and obvious.  If we weren't in
tstage 4, I would simply commit it.

Because allocatable strings are a major convenience for
users, I would still like to commit this to trunk and
to the affected branches.

So, OK for these branches?

Regards

	Thomas

2016-02-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/68147
         PR fortran/47674
         * frontend-passes.c (realloc_string_callbac): Don't set
         walk_subtrees.

2016-02-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/68147
         PR fortran/47674
         * gfortran.dg/realloc_on_assign_26.f90:  New test case.
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