testsuite: Fix up libgomp.fortran/pr100981-2.f90 testcase [PR100981]

The dsdotr and dsdoti variables uninitialized and the testcase fails e.g.
on i686-linux.  Fixed by zero initialization.

2021-06-10  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/100981
	* testsuite/libgomp.fortran/pr100981-2.f90 (cdcdot): Initialize
	dsdotr and dsdoti to 0.
1 file changed