[PATCH bluetooth-next] 6lowpan: iphc: fix invalid case handling

This patch fixes the return value in a case which should never occur.
Instead returning "-EINVAL" we return LOWPAN_IPHC_DAM_00 which is
invalid on context based addresses. Also change the WARN_ON_ONCE to
WARN_ONCE which was suggested by Dan Carpenter.

Reported-by: Dan Carpenter <redacted>
Signed-off-by: Alexander Aring <redacted>
---
 net/6lowpan/iphc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index 06287ac..7217251 100644
--- a/net/6lowpan/iphc.c
+++ b/net/6lowpan/iphc.c

@@ -811,8 +811,8 @@ static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct in6_addr *ipaddr,
 		goto out;
 	}
 
-	WARN_ON_ONCE("context found but no address mode matched\n");
-	return -EINVAL;
+	WARN_ONCE(1, "context found but no address mode matched\n");
+	return LOWPAN_IPHC_DAM_00;
 out:
 
 	if (sam)

-- 
2.7.1