vmci: propagate msghdr all way down to __qp_memcpy_from_queue()

... and switch it to memcpy_to_msg()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/vmw_vmci_api.h b/include/linux/vmw_vmci_api.h
index 023430e..5691f75 100644
--- a/include/linux/vmw_vmci_api.h
+++ b/include/linux/vmw_vmci_api.h
@@ -24,6 +24,7 @@
 #define VMCI_KERNEL_API_VERSION_2 2
 #define VMCI_KERNEL_API_VERSION   VMCI_KERNEL_API_VERSION_2
 
+struct msghdr;
 typedef void (vmci_device_shutdown_fn) (void *device_registration,
 					void *user_data);
 
@@ -75,8 +76,8 @@
 ssize_t vmci_qpair_enquev(struct vmci_qp *qpair,
 			  void *iov, size_t iov_size, int mode);
 ssize_t vmci_qpair_dequev(struct vmci_qp *qpair,
-			  void *iov, size_t iov_size, int mode);
-ssize_t vmci_qpair_peekv(struct vmci_qp *qpair, void *iov, size_t iov_size,
+			  struct msghdr *msg, size_t iov_size, int mode);
+ssize_t vmci_qpair_peekv(struct vmci_qp *qpair, struct msghdr *msg, size_t iov_size,
 			 int mode);
 
 #endif /* !__VMW_VMCI_API_H__ */