pvscsi: fix compilation on 32 bit hosts

This fixes the following error:
In file included from qemu/include/trace.h:4:0,
                 from trace/generated-events.c:3:
./trace/generated-tracers.h: In function ‘trace_pvscsi_get_sg_list’:
./trace/generated-tracers.h:4271:9: error: format ‘%lu’ expects argument of
type ‘long unsigned int’, but argument 4 has type ‘size_t’ [-Werror=format]
Signed-off-by: NHervé Poussineau <hpoussin@reactos.org>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

trace-events

@@ -776,7 +776,7 @@ pvscsi_update_irq_msi(void) "sending MSI notification"
 pvscsi_cmp_ring_put(unsigned long addr) "got completion descriptor 0x%lx"
 pvscsi_msg_ring_put(unsigned long addr) "got message descriptor 0x%lx"
 pvscsi_complete_request(uint64_t context, uint64_t len, uint8_t sense_key) "completion: ctx: 0x%"PRIx64", len: 0x%"PRIx64", sense key: %u"
-pvscsi_get_sg_list(int nsg, size_t size) "get SG list: depth: %u, size: %lu"
+pvscsi_get_sg_list(int nsg, size_t size) "get SG list: depth: %u, size: %zu"
 pvscsi_get_next_sg_elem(uint32_t flags) "unknown flags in SG element (val: 0x%x)"
 pvscsi_command_complete_not_found(uint32_t tag) "can't find request for tag 0x%x"
 pvscsi_command_complete_data_run(void) "not all data required for command transferred"