Fix a comment

This commit was SVN r5030.

src/op/op.c

@@ -486,7 +486,7 @@ ompi_op_t *ompi_op_create(bool commute,
 
       /* The new object is valid -- initialize it.  If this is being
          created from fortran, the fortran MPI API wrapper function
-         will override the o_fortran_field directly.  We cast the
+         will override the o_flags field directly.  We cast the
          function pointer type to the fortran type arbitrarily -- it
          only has to be a function pointer in order to store properly,
          it doesn't matter what type it is (we'll cast it to the Right