[4.4-stable 17/22] cw1200: fix bogus maybe-uninitialized warning

[Arnd Bergmann]

commit 7fc1503c906f0fac62d3506a6e993e49fb996248 upstream.

On x86, the cw1200 driver produces a rather silly warning about the
possible use of the 'ret' variable without an initialization
presumably after being confused by the architecture specific definition
of WARN_ON:

drivers/net/wireless/st/cw1200/wsm.c: In function ‘wsm_handle_rx’:
drivers/net/wireless/st/cw1200/wsm.c:1457:9: error: ‘ret’ may be used 
uninitialized in this function [-Werror=maybe-uninitialized]

We have already checked that 'count' is larger than 0 here, so
we know that 'ret' is initialized. Changing the 'for' loop
into do/while also makes this clear to the compiler.

Suggested-by: David Laight <david.lai...@aculab.com>
Signed-off-by: Arnd Bergmann <a...@arndb.de>
Signed-off-by: Kalle Valo <kv...@codeaurora.org>
[arnd: rebased to 4.4]
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/net/wireless/cw1200/wsm.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/cw1200/wsm.c 
b/drivers/net/wireless/cw1200/wsm.c
index 9e0ca3048657..3dd46c78c1cc 100644
--- a/drivers/net/wireless/cw1200/wsm.c
+++ b/drivers/net/wireless/cw1200/wsm.c
@@ -379,7 +379,6 @@ static int wsm_multi_tx_confirm(struct cw1200_common *priv,
 {
        int ret;
        int count;
-       int i;
 
        count = WSM_GET32(buf);
        if (WARN_ON(count <= 0))
@@ -395,11 +394,10 @@ static int wsm_multi_tx_confirm(struct cw1200_common 
*priv,
        }
 
        cw1200_debug_txed_multi(priv, count);
-       for (i = 0; i < count; ++i) {
+       do {
                ret = wsm_tx_confirm(priv, buf, link_id);
-               if (ret)
-                       return ret;
-       }
+       } while (!ret && --count);
+
        return ret;
 
 underflow:
-- 
2.9.0