Drivers: hv: vmbus: respect what we get from hv_get_synint_state()

I didn't really hit a bug, but just happened to notice the redundant line.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/hv.c

@@ -302,7 +302,6 @@ int hv_synic_init(unsigned int cpu)
 	hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
 			    shared_sint.as_uint64);
 
-	shared_sint.as_uint64 = 0;
 	shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
 	shared_sint.masked = false;
 	if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED)