Xentrace: Remove assertions to avoid system crashes on debug build xen.

Signed-off-by: Yosuke Iwamatsu <y-iwamatsu@ab.jp.nec.com>

diff -r 2d761ca771fb xen/common/trace.c
--- a/xen/common/trace.c	Thu Oct 04 17:58:16 2007 +0100
+++ b/xen/common/trace.c	Fri Oct 05 10:28:33 2007 +0900
@@ -435,12 +435,10 @@ void __trace_var(u32 event, int cycles, 
         {
             bytes_to_wrap -= LOST_REC_SIZE;
             if ( bytes_to_wrap == 0 )
-                bytes_to_wrap == data_size;
+                bytes_to_wrap = data_size;
         }
         total_size += LOST_REC_SIZE;
     }
-
-    ASSERT(bytes_to_wrap == calc_bytes_to_wrap(buf));
 
     if ( rec_size > bytes_to_wrap )
     {
@@ -484,8 +482,6 @@ void __trace_var(u32 event, int cycles, 
         insert_lost_records(buf);
     }
 
-    ASSERT(bytes_to_wrap == calc_bytes_to_wrap(buf));
-
     if ( rec_size > bytes_to_wrap )
         insert_wrap_record(buf, rec_size);