Torture testing: 'libgomp.fortran/use_device_ptr-optional-2.f90'

Fix-up for commit a2c26c50 (r278046) "Fortran]
Support absent optional args with use_device_{ptr,addr}".

	libgomp/
	* testsuite/libgomp.fortran/use_device_ptr-optional-2.f90: Add
	'dg-do run'.

libgomp/ChangeLog

+2020-04-29  Thomas Schwinge  <thomas@codesourcery.com>
+
+	* testsuite/libgomp.fortran/use_device_ptr-optional-2.f90: Add
+	'dg-do run'.
+
 2020-04-23  Andrew Stubbs  <ams@codesourcery.com>
 
 	PR other/94629

libgomp/testsuite/libgomp.fortran/use_device_ptr-optional-2.f90

+! { dg-do run }
 ! Check whether absent optional arguments are properly
 ! handled with use_device_{addr,ptr}.
 program main