Index: qemu-log.h
===================================================================
--- qemu-log.h	(revision 6367)
+++ qemu-log.h	(working copy)
@@ -63,10 +63,12 @@
         disas(logfile, (start), (len))
 
 /* page_dump() output to the log file: */
-#define log_page_dump() page_dump(logfile)
+#define log_page_dump() do {     \
+        if (logfile)             \
+            page_dump(logfile);  \
+    } while (0)
 
 
-
 /* Maintenance: */
 
 /* fflush() the log file */