crypto: bcm - Drop unused setting of local 'ptr' variable

spum_cipher_req_init() assigns 'spu_hdr' to local 'ptr' variable and
later increments 'ptr' over specific fields like it was meant to point
to pieces of message for some purpose.  However the code does not read
'ptr' at all thus this entire iteration over 'spu_hdr' seams pointless.

Reported by clang W=1 build:

  drivers/crypto/bcm/spu.c:839:6: error: variable 'ptr' set but not used [-Werror,-Wunused-but-set-variable]

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

Author: krzk

drivers/crypto/bcm/spu.c

@@ -836,7 +836,6 @@ u16 spum_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms)
 	u32 cipher_bits = 0;
 	u32 ecf_bits = 0;
 	u8 sctx_words = 0;
-	u8 *ptr = spu_hdr;
 
 	flow_log("%s()\n", __func__);
 	flow_log("  cipher alg:%u mode:%u type %u\n", cipher_parms->alg,
@@ -847,7 +846,6 @@ u16 spum_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms)
 
 	/* starting out: zero the header (plus some) */
 	memset(spu_hdr, 0, sizeof(struct SPUHEADER));
-	ptr += sizeof(struct SPUHEADER);
 
 	/* format master header word */
 	/* Do not set the next bit even though the datasheet says to */
@@ -861,10 +859,8 @@ u16 spum_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms)
 
 	/* copy the encryption keys in the SAD entry */
 	if (cipher_parms->alg) {
-		if (cipher_parms->key_len) {
-			ptr += cipher_parms->key_len;
+		if (cipher_parms->key_len)
 			sctx_words += cipher_parms->key_len / 4;
-		}
 
 		/*
 		 * if encrypting then set IV size, use SCTX IV unless no IV
@@ -873,7 +869,6 @@ u16 spum_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms)
 		if (cipher_parms->iv_len) {
 			/* Use SCTX IV */
 			ecf_bits |= SCTX_IV;
-			ptr += cipher_parms->iv_len;
 			sctx_words += cipher_parms->iv_len / 4;
 		}
 	}