[PATCH v3] block/iscsi:use the flags in iscsi_open() prevent Clang warning

[Chen Qun]

Clang static code analyzer show warning:
  block/iscsi.c:1920:9: warning: Value stored to 'flags' is never read
        flags &= ~BDRV_O_RDWR;
        ^        ~~~~~~~~~~~~

In iscsi_allocmap_init() only checks BDRV_O_NOCACHE, which
is the same in both of flags and bs->open_flags.
We can use the flags instead bs->open_flags to prevent Clang warning.

Reported-by: Euler Robot <address@hidden>
Signed-off-by: Chen Qun <address@hidden>
Reviewed-by: Kevin Wolf <address@hidden>
---
Cc: Ronnie Sahlberg <address@hidden>
Cc: Paolo Bonzini <address@hidden>
Cc: Peter Lieven <address@hidden>
Cc: Kevin Wolf <address@hidden>
Cc: Max Reitz <address@hidden>
Cc: Laurent Vivier <address@hidden>

v1->v2:
 Keep the 'flags' then use it(Base on Kevin's comments).

v2->v3:
 Modify subject and commit messages(Base on Kevin's and Laurent's comments).
---
 block/iscsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/iscsi.c b/block/iscsi.c
index 682abd8e09..50bae51700 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -2002,7 +2002,7 @@ static int iscsi_open(BlockDriverState *bs, QDict 
*options, int flags,
         iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran *
             iscsilun->block_size;
         if (iscsilun->lbprz) {
-            ret = iscsi_allocmap_init(iscsilun, bs->open_flags);
+            ret = iscsi_allocmap_init(iscsilun, flags);
         }
     }
 
-- 
2.23.0