crypto: caam: - Use kmemdup() function

Use kmemdup() rather than duplicating its implementation.

By usign kmemdup() we can also get rid of the 'val' variable.

Detected with Coccinelle script.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/caampkc.c

@@ -783,19 +783,12 @@ static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen)
  */
 static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes)
 {
-	u8 *val;
 
 	caam_rsa_drop_leading_zeros(&buf, nbytes);
 	if (!*nbytes)
 		return NULL;
 
-	val = kzalloc(*nbytes, GFP_DMA | GFP_KERNEL);
-	if (!val)
-		return NULL;
-
-	memcpy(val, buf, *nbytes);
-
-	return val;
+	return kmemdup(buf, *nbytes, GFP_DMA | GFP_KERNEL);
 }
 
 static int caam_rsa_check_key_length(unsigned int len)