HSI: cmt_speech: fix error return code

Return a negative error code on failure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
{ ... return ret; }
|
ret = 0
)
... when != ret = e1
when != &ret
*if(...)
{
... when != ret = e2
when forall
return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <[e-mail]>
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/hsi/clients/cmt_speech.c

···
 	}
 	hsi_if->master = ssip_slave_get_master(cl);
 	if (IS_ERR(hsi_if->master)) {
+		err = PTR_ERR(hsi_if->master);
 		dev_err(&cl->device, "Could not get HSI master client\n");
 		goto leave4;
 	}