powerpc/nvram: use kmemdup rather than duplicating its implementation

---
 arch/powerpc/kernel/nvram_64.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
 
diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index 1e703f8..6f6597b 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -541,10 +541,9 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
 			time->tv_sec = be64_to_cpu(oops_hdr->timestamp);
 			time->tv_nsec = 0;
 		}
-		*buf = kmalloc(length, GFP_KERNEL);
+		*buf = kmemdup(buff + hdr_size, length, GFP_KERNEL);
 		if (*buf == NULL)
 			return -ENOMEM;
-		memcpy(*buf, buff + hdr_size, length);
 		kfree(buff);
 
 		if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)