fix test

Author: astaple

dbtests/btreetests.cpp

@@ -62,10 +62,8 @@ namespace BtreeTests {
             char sub[17];
             sprintf( sub, "%.16llx", n );
             string val( len, ' ' );
-            for( int i = 0; i < len; i += 16 ) {
-                for( int j = 0; j < 16; ++j ) {
-                    val[ i + j ] = sub[ j ];
-                }
+            for( int i = 0; i < len; ++i ) {
+                val[ i ] = sub[ i % 16 ];
             }            
             return val;
         }