iris: Initialise unset iris_fence.seqno
As we dropped the iris_fence.count and now always iterate over the fixed size array of seqno, we must make sure that we initialise the full array.
==38644== Conditional jump or move depends on uninitialised value(s)
==38644== at 0xF7FBFAA: pipe_resource_reference (u_inlines.h:142)
==38644== by 0xF7FC22F: iris_seqno_destroy (iris_seqno.c:38)
==38644== by 0xF7E8930: iris_seqno_reference (iris_seqno.h:89)
==38644== by 0xF7E8BC3: iris_fence_destroy (iris_fence.c:131)
==38644== by 0xF7E8C41: iris_fence_reference (iris_fence.c:143)
==38644== by 0xEF24525: dri2_destroy_fence (dri_helpers.c:176)
==38644== by 0x4865DC2: dri2_egl_unref_sync (egl_dri2.c:3302)
==38644== by 0x48661E8: dri2_destroy_sync (egl_dri2.c:3433)
==38644== by 0x4855BA4: _eglDestroySync (eglapi.c:1952)
==38644== by 0x4855CF5: eglDestroySyncKHR (eglapi.c:1972)
==38644== by 0x402628: test_cleanup (egl_khr_fence_sync.c:232)
==38644== by 0x40421E: test_eglCreateSyncKHR_native_from_fd (egl_khr_fence_sync.c:1521)
Closes: #2909 (closed)
Edited by Lionel Landwerlin