ibuf_get_volume_buffered_hash(): Use a proper type cast

On 64-bit systems, the constant 1 would be 32-bit (int or unsigned)
by default. Cast the constant to ulint before shifting to avoid a
-fsanitize=undefined warning or any potential overflow.

storage/innobase/ibuf/ibuf0ibuf.cc

@@ -2895,8 +2895,7 @@ ibuf_get_volume_buffered_hash(
 	fold = ut_fold_binary(data, len);
 
 	hash += (fold / (CHAR_BIT * sizeof *hash)) % size;
-	bitmask = static_cast<ulint>(
-		1 << (fold % (CHAR_BIT * sizeof(*hash))));
+	bitmask = static_cast<ulint>(1) << (fold % (CHAR_BIT * sizeof(*hash)));
 
 	if (*hash & bitmask) {
 

storage/xtradb/ibuf/ibuf0ibuf.cc

@@ -2935,8 +2935,7 @@ ibuf_get_volume_buffered_hash(
 	fold = ut_fold_binary(data, len);
 
 	hash += (fold / (CHAR_BIT * sizeof *hash)) % size;
-	bitmask = static_cast<ulint>(
-		1 << (fold % (CHAR_BIT * sizeof(*hash))));
+	bitmask = static_cast<ulint>(1) << (fold % (CHAR_BIT * sizeof(*hash)));
 
 	if (*hash & bitmask) {