This code causes a problem for flush_epd_write_bio() because | has
higher precedence than ?: so it basically turns into:

        ((bio)->bi_opf |= REQ_SYNC;

Which is wrong.

Fixes: ef295ecf090d ("block: better op and flags encoding")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 562ac46..67fae32 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -208,7 +208,7 @@ enum req_flag_bits {
 
 /* obsolete, don't use in new code */
 #define bio_set_op_attrs(bio, op, op_flags) \
-       ((bio)->bi_opf |= (op | op_flags))
+       ((bio)->bi_opf |= ((op) | (op_flags)))
 
 static inline bool op_is_write(unsigned int op)
 {
--
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