Remove one of the frees added in r9916. stat_name points to somewhere

within the same string that destfname points to the start of, so
freeing it causes at best a double-free of destfname and more likely a
free of something that isn't even the start of an allocated block.

[originally from svn r9974]
[r9916 == cc4f38df148c84183efce644cd48f822233b962a]

pscp.c

@@ -2026,7 +2026,6 @@ static void sink(char *targ, char *src)
 	    set_file_times(f, act.mtime, act.atime);
 	}
 
-	sfree(stat_name);
 	close_wfile(f);
 	if (wrerror) {
 	    run_err("%s: Write error", destfname);