staging: lustre: osc: Use !x to check for kzalloc failure

!x is more normal for kzalloc failure in the kernel.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x;
statement S1, S2;
@@

x = kzalloc(...);
if (
- x == NULL
+ !x
 ) S1 else S2
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/osc/osc_dev.c

@@ -218,7 +218,7 @@ static struct lu_device *osc_device_alloc(const struct lu_env *env,
 	int rc;
 
 	od = kzalloc(sizeof(*od), GFP_NOFS);
-	if (od == NULL)
+	if (!od)
 		return ERR_PTR(-ENOMEM);
 
 	cl_device_init(&od->od_cl, t);

drivers/staging/lustre/lustre/osc/osc_request.c

@@ -119,7 +119,7 @@ static int osc_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
 
 	if (*lmmp == NULL) {
 		*lmmp = kzalloc(lmm_size, GFP_NOFS);
-		if (*lmmp == NULL)
+		if (!*lmmp)
 			return -ENOMEM;
 	}
 
@@ -1909,7 +1909,7 @@ int osc_build_rpc(const struct lu_env *env, struct client_obd *cli,
 		mpflag = cfs_memory_pressure_get_and_set();
 
 	crattr = kzalloc(sizeof(*crattr), GFP_NOFS);
-	if (crattr == NULL) {
+	if (!crattr) {
 		rc = -ENOMEM;
 		goto out;
 	}