RDMA/ucma: Test ucma_alloc_multicast() return against NULL, not with IS_ERR()

In case of error, the function ucma_alloc_multicast() returns a NULL
pointer, but never returns an ERR pointer.  So after a call to this
function, an IS_ERR test should be replaced by a NULL test.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@match bad_is_err_test@
expression x, E;
@@

x = ucma_alloc_multicast(...)
... when != x = E
IS_ERR(x)
// </smpl>
Signed-off-by: Julien Brunel <brunel@diku.dk>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/core/ucma.c

@@ -904,8 +904,8 @@ static ssize_t ucma_join_multicast(struct ucma_file *file,
 
 	mutex_lock(&file->mut);
 	mc = ucma_alloc_multicast(ctx);
-	if (IS_ERR(mc)) {
-		ret = PTR_ERR(mc);
+	if (!mc) {
+		ret = -ENOMEM;
 		goto err1;
 	}