PATCH: disk: report error if file file with same already exists while renaming.

Hello,

In the disk redirection, while renaming a file on the disk, if a file
with the same name already exists, then it is simply overwritten.
Attached patch signals a name collision to the server. The server
displays an appropriate message notifying the session user of the
condition.

Thanks and Regards
~Sameer

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diff --git a/disk.c b/disk.c
index df9b433..61b4091 100644
--- a/disk.c
+++ b/disk.c
@@ -812,6 +812,10 @@ disk_set_information(RD_NTHANDLE handle, uint32 info_class, STREAM in, STREAM ou
 			sprintf(fullpath, "%s%s", g_rdpdr_device[pfinfo->device_id].local_path,
 				newname);
 
+			/* check if a file with same name exists */
+			if (access (fullpath, F_OK) == 0)
+				return RD_STATUS_OBJECT_NAME_COLLISION;
+
 			if (rename(pfinfo->path, fullpath) != 0)
 			{
 				perror("rename");