[PATCH] parisc: Increase the usage check of kmalloc allocated object a

[Li zeming]

In the case of memory allocation failure, no alignment operation is
required.

Signed-off-by: Li zeming <zeming@xxxxxxxxxxxx>
---
 drivers/parisc/iosapic.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/parisc/iosapic.c b/drivers/parisc/iosapic.c
index 3a8c98615634..33de438916d3 100644
--- a/drivers/parisc/iosapic.c
+++ b/drivers/parisc/iosapic.c
@@ -229,7 +229,9 @@ static struct irt_entry *iosapic_alloc_irt(int num_entries)
 	 * 4-byte alignment on 32-bit kernels
 	 */
 	a = (unsigned long)kmalloc(sizeof(struct irt_entry) * num_entries + 8, GFP_KERNEL);
-	a = (a + 7UL) & ~7UL;
+	if (a)
+		a = (a + 7UL) & ~7UL;
+
 	return (struct irt_entry *)a;
 }
 
-- 
2.18.2