fortran: Fix PR number in comment of testcase for PR 69497

The testcase was originally committed with an incorrect changelog and PR
number. The changelog was fixed later, but not the comment in the test.

	PR fortran/69497
	* gfortran.dg/pr69497.f90: Fix PR number in comment.

From-SVN: r279657

gcc/testsuite/ChangeLog

+2019-12-20  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR fortran/69497
+	* gfortran.dg/pr69497.f90: Fix PR number in comment.
+
 2019-12-20  Stam Markianos-Wright  <stam.markianos-wright@arm.com>
 
 	* lib/target-supports.exp 

gcc/testsuite/gfortran.dg/pr69497.f90

 ! { dg-do compile }
-! PR89497
+! PR69497
 program p
    block
    do