rxrpc: remove redundant initialization of variable 'len'

The variable 'len' is being initialized with a value that is never
read and it is re-assigned later, hence the initialization is redundant
and can be removed.

Cleans up clang warning:
net/rxrpc/recvmsg.c:275:15: warning: Value stored to 'len' during its
initialization is never read
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/rxrpc/recvmsg.c

@@ -272,7 +272,7 @@ static int rxrpc_locate_data(struct rxrpc_call *call, struct sk_buff *skb,
 			     unsigned int *_offset, unsigned int *_len)
 {
 	unsigned int offset = sizeof(struct rxrpc_wire_header);
-	unsigned int len = *_len;
+	unsigned int len;
 	int ret;
 	u8 annotation = *_annotation;