[PATCH v1 1/4] iosf_mbi: check result for all calls of debugfs API

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

While here, replase IS_ERR_OR_NULL(x) to just !x since first one does the job
for us.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 arch/x86/kernel/iosf_mbi.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/iosf_mbi.c b/arch/x86/kernel/iosf_mbi.c
index 82f8d02..2362da9 100644
--- a/arch/x86/kernel/iosf_mbi.c
+++ b/arch/x86/kernel/iosf_mbi.c
@@ -240,17 +240,17 @@ static void iosf_sideband_debug_init(void)
 
 	/* mdr */
 	d = debugfs_create_x32("mdr", 0660, iosf_dbg, &dbg_mdr);
-	if (IS_ERR_OR_NULL(d))
+	if (!d)
 		goto cleanup;
 
 	/* mcrx */
-	debugfs_create_x32("mcrx", 0660, iosf_dbg, &dbg_mcrx);
-	if (IS_ERR_OR_NULL(d))
+	d = debugfs_create_x32("mcrx", 0660, iosf_dbg, &dbg_mcrx);
+	if (!d)
 		goto cleanup;
 
 	/* mcr - initiates mailbox tranaction */
-	debugfs_create_file("mcr", 0660, iosf_dbg, &dbg_mcr, &iosf_mcr_fops);
-	if (IS_ERR_OR_NULL(d))
+	d = debugfs_create_file("mcr", 0660, iosf_dbg, &dbg_mcr, &iosf_mcr_fops);
+	if (!d)
 		goto cleanup;
 
 	return;
-- 
2.1.4