[patch, fortran] Fix PR 67219, erroneous warning

[Thomas Koenig]

Hello world,

the regression in question was caused by issuing a conversion
warning for a complex constant too early, when the statement would be
rejected later.

The solution is to throw away the warning if we do not find that
comma.

Regression-tested.  OK for trunk and 6-branch?

Regards

	Thomas

2016-10-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/67219
         * arith.c (gfc_int2real):  Change gfc_warning_now
         to gfc_warning.
         * primary.c (match_complex_constant):  If there
         is no comma, throw away any warning which might have
         been issued by gfc_int2real.

2016-10-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/67219
         * gfortran.dg/pr67219.f90:  New test.
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