Fix bug of DO_RANGE_CHECK_CLAMP

The low/high values for clamp() should be swapped
BUG=aomedia:2038

Change-Id: Ice08294bb83e630f2b65e5e2dcbdf6b7f3f2e7f6

av1/common/av1_txfm.h

diff --git a/av1/common/av1_txfm.h b/av1/common/av1_txfm.h
index c9cc798..caab8e1 100644
--- a/av1/common/av1_txfm.h
+++ b/av1/common/av1_txfm.h
@@ -64,7 +64,7 @@
 #endif  // CONFIG_COEFFICIENT_RANGE_CHECKING
 #if DO_RANGE_CHECK_CLAMP
   bit = AOMMIN(bit, 31);
-  return clamp(value, (1 << (bit - 1)) - 1, -(1 << (bit - 1)));
+  return clamp(value, -(1 << (bit - 1)), (1 << (bit - 1)) - 1);
 #endif  // DO_RANGE_CHECK_CLAMP
   (void)bit;
   return value;