ksmbd: set NegotiateContextCount once instead of every inc

There are no early returns, so marshalling the incremented
NegotiateContextCount with every context is unnecessary.
Signed-off-by: David Disseldorp <ddiss@suse.de>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/ksmbd/smb2pdu.c

@@ -817,7 +817,6 @@ static void assemble_neg_contexts(struct ksmbd_conn *conn,
 		    "assemble SMB2_PREAUTH_INTEGRITY_CAPABILITIES context\n");
 	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt,
 			   conn->preauth_info->Preauth_HashId);
-	rsp->NegotiateContextCount = cpu_to_le16(neg_ctxt_cnt);
 	inc_rfc1001_len(smb2_buf_len, AUTH_GSS_PADDING);
 	ctxt_size = sizeof(struct smb2_preauth_neg_context);
 	/* Round to 8 byte boundary */
@@ -829,7 +828,7 @@ static void assemble_neg_contexts(struct ksmbd_conn *conn,
 			    "assemble SMB2_ENCRYPTION_CAPABILITIES context\n");
 		build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt,
 				   conn->cipher_type);
-		rsp->NegotiateContextCount = cpu_to_le16(++neg_ctxt_cnt);
+		neg_ctxt_cnt++;
 		ctxt_size += sizeof(struct smb2_encryption_neg_context) + 2;
 		/* Round to 8 byte boundary */
 		pneg_ctxt +=
@@ -844,7 +843,7 @@ static void assemble_neg_contexts(struct ksmbd_conn *conn,
 		/* Temporarily set to SMB3_COMPRESS_NONE */
 		build_compression_ctxt((struct smb2_compression_capabilities_context *)pneg_ctxt,
 				       conn->compress_algorithm);
-		rsp->NegotiateContextCount = cpu_to_le16(++neg_ctxt_cnt);
+		neg_ctxt_cnt++;
 		ctxt_size += sizeof(struct smb2_compression_capabilities_context) + 2;
 		/* Round to 8 byte boundary */
 		pneg_ctxt += round_up(sizeof(struct smb2_compression_capabilities_context) + 2,
@@ -856,7 +855,7 @@ static void assemble_neg_contexts(struct ksmbd_conn *conn,
 		ksmbd_debug(SMB,
 			    "assemble SMB2_POSIX_EXTENSIONS_AVAILABLE context\n");
 		build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
-		rsp->NegotiateContextCount = cpu_to_le16(++neg_ctxt_cnt);
+		neg_ctxt_cnt++;
 		ctxt_size += sizeof(struct smb2_posix_neg_context);
 		/* Round to 8 byte boundary */
 		pneg_ctxt += round_up(sizeof(struct smb2_posix_neg_context), 8);
@@ -868,10 +867,11 @@ static void assemble_neg_contexts(struct ksmbd_conn *conn,
 			    "assemble SMB2_SIGNING_CAPABILITIES context\n");
 		build_sign_cap_ctxt((struct smb2_signing_capabilities *)pneg_ctxt,
 				    conn->signing_algorithm);
-		rsp->NegotiateContextCount = cpu_to_le16(++neg_ctxt_cnt);
+		neg_ctxt_cnt++;
 		ctxt_size += sizeof(struct smb2_signing_capabilities) + 2;
 	}
 
+	rsp->NegotiateContextCount = cpu_to_le16(neg_ctxt_cnt);
 	inc_rfc1001_len(smb2_buf_len, ctxt_size);
 }