[staging] staging/mei: fix possible usage of uninitialized variable

[Tomas Winkler <tomas.winkler@intel.com>]

Fix warning: reported in http://marc.info/?l=linux-kernel&m=130812960402606&w=2

drivers/staging/mei/interrupt.c: warning: 'buffer' may be used uninitialized in this function:  => 198

It is a real issue and wrong path in execution is taken when
list is empty or (cl && _mei_irq_thread_state_ok(cl, mei_hdr))
evaluates to false

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
This patch should be considered for 3.0

 drivers/staging/mei/interrupt.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/mei/interrupt.c b/drivers/staging/mei/interrupt.c
index 2ff30ee..9cb186b 100644
--- a/drivers/staging/mei/interrupt.c
+++ b/drivers/staging/mei/interrupt.c
@@ -195,7 +195,7 @@ static int mei_irq_thread_read_client_message(struct mei_io_list *complete_list,
 {
 	struct mei_cl *cl;
 	struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
-	unsigned char *buffer;
+	unsigned char *buffer = NULL;
 
 	dev_dbg(&dev->pdev->dev, "start client msg\n");
 	if (!(dev->read_list.status == 0 &&
-- 
1.7.4.4

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