fix fortran 0 lengthed arrays

[Mike Stump]

This fixes a small bug in the conversion of the fortran front-end conversion to 
wide-int.

        PR fortran/61109
        * trans-array.c (gfc_conv_array_initializer): Fix wide-int
        conversion bug.

Index: trans-array.c
===================================================================
--- trans-array.c       (revision 210276)
+++ trans-array.c       (working copy)
@@ -5405,7 +5405,6 @@ gfc_conv_array_initializer (tree type, g
        gfc_conv_structure (&se, expr, 1);
 
       wtmp = wi::to_offset (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) + 1;
-      gcc_assert (wtmp != 0);
       /* This will probably eat buckets of memory for large arrays.  */
       while (wtmp != 0)
         {