spi: spi-amd: fix warning

remove unused variable "opcode"
Signed-off-by: Sanjay R Mehta <sanju.mehta@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/1588049801-37995-1-git-send-email-sanju.mehta@amd.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-amd.c

@@ -168,7 +168,7 @@ static inline int amd_spi_fifo_xfer(struct amd_spi *amd_spi,
 {
 	struct spi_master *master = amd_spi->master;
 	struct spi_transfer *xfer = NULL;
-	u8 cmd_opcode, opcode = 0;
+	u8 cmd_opcode;
 	u8 *buf = NULL;
 	u32 m_cmd = 0;
 	u32 i = 0;