rpcrt4: Cast-qual warnings fix (4 of 4)

[Andrew Talbot]

Changelog:
    rpcrt4: Cast-qual warnings fix.

diff -urN a/dlls/rpcrt4/rpc_transport.c b/dlls/rpcrt4/rpc_transport.c
--- a/dlls/rpcrt4/rpc_transport.c	2006-06-14 12:55:26.000000000 +0100
+++ b/dlls/rpcrt4/rpc_transport.c	2006-09-25 21:07:21.000000000 +0100
@@ -899,8 +899,8 @@
                                         char **networkaddr,
                                         char **endpoint)
 {
-    twr_empty_floor_t *protocol_floor;
-    twr_empty_floor_t *floor4;
+    const twr_empty_floor_t *protocol_floor;
+    const twr_empty_floor_t *floor4;
     const struct protseq_ops *protseq_ops = NULL;
     RPC_STATUS status;
     int i;
@@ -908,7 +908,7 @@
     if (tower_size < sizeof(*protocol_floor))
         return EPT_S_NOT_REGISTERED;
 
-    protocol_floor = (twr_empty_floor_t *)tower_data;
+    protocol_floor = (const twr_empty_floor_t *)tower_data;
     tower_data += sizeof(*protocol_floor);
     tower_size -= sizeof(*protocol_floor);
     if ((protocol_floor->count_lhs != sizeof(protocol_floor->protid)) ||
@@ -917,7 +917,7 @@
     tower_data += protocol_floor->count_rhs;
     tower_size -= protocol_floor->count_rhs;
 
-    floor4 = (twr_empty_floor_t *)tower_data;
+    floor4 = (const twr_empty_floor_t *)tower_data;
     if ((tower_size < sizeof(*floor4)) ||
         (floor4->count_lhs != sizeof(floor4->protid)))
         return EPT_S_NOT_REGISTERED;