Fix CI failure.

For ASanDbg tests of the earlier implementation of the
mbedtls_platform_random_in_range(), there was no case where ‘shift’
value was zero. Such a case generated a bit shift of 32, which is treated
as an error by ASanDbg. Increasing the ‘shift’ value by one ensures that
it will always be non-zero.

Signed-off-by: Piotr Nowicki <[email protected]>

library/platform_util.c

@@ -269,8 +269,8 @@ void mbedtls_platform_random_delay( void )
         i++;
         /* Dummy calculations to increase the time between iterations and
          * make side channel attack more difficult by reducing predictability
-         * of its behaviour */
-        shift = rn_2 & 0x07;
+         * of its behaviour. */
+        shift = ( rn_2 & 0x07 ) + 1;
         if ( i % 2 )
             rn_2 = ( rn_2 >> shift ) | ( rn_2 << ( 32 - shift ) );
         else