Make peakfile block scanning more robust.

Timeline/Peaks.C

@@ -187,12 +187,15 @@ public:
             std::list <block_descriptor> blocks;
 
             /* scan all blocks */
-            do
+            for ( ;; )
             {
                 peakfile_block_header bh;
 
                 fread( &bh, sizeof( bh ), 1, _fp );
 
+                if ( feof( _fp ) )
+                    break;
+
 //                printf( "chunksize=%lu, skip=%lu\n", (unsigned long)bh.chunksize, (unsigned long) bh.skip );
 
                 ASSERT( bh.chunksize, "Invalid peak file structure!" );
@@ -209,7 +212,6 @@ public:
                     break;
                 }
             }
-            while ( ! feof( _fp ) );
 
             if ( ! blocks.size() )
                 FATAL( "invalid peak file?" );