do_iterator.f90: Remove bogus dg-warning.

gcc/testsuite/ChangeLog:

2014-12-11  Manuel López-Ibáñez  <manu@gcc.gnu.org>

        * gfortran.dg/do_iterator.f90: Remove bogus dg-warning.

From-SVN: r218628

gcc/testsuite/gfortran.dg/do_iterator.f90

@@ -10,4 +10,3 @@ DO I=1,5       ! { dg-error "cannot be redefined" "changing do-iterator 3" }
    READ(5,*,iostat=i) j ! { dg-error "cannot be redefined" "changing do-iterator 3" }
 ENDDO
 END
-! { dg-error "Invalid character" "character" { target *-*-* } 7 }