fix the following coccicheck warning:

arch/mips/cavium-octeon/executive/cvmx-spi.c:108:5-8: Unneeded variable: 
"res".

Signed-off-by: Mingtong Bao <baomingtong001@208suo.com>
---
  arch/mips/cavium-octeon/executive/cvmx-spi.c | 5 ++---
  1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/mips/cavium-octeon/executive/cvmx-spi.c 
b/arch/mips/cavium-octeon/executive/cvmx-spi.c
index 1f8b85473677..5906cc551f75 100644
--- a/arch/mips/cavium-octeon/executive/cvmx-spi.c
+++ b/arch/mips/cavium-octeon/executive/cvmx-spi.c
@@ -105,10 +105,9 @@ void cvmx_spi_set_callbacks(cvmx_spi_callbacks_t 
*new_callbacks)
  int cvmx_spi_start_interface(int interface, cvmx_spi_mode_t mode, int 
timeout,
                   int num_ports)
  {
-    int res = -1;

      if (!(OCTEON_IS_MODEL(OCTEON_CN38XX) || 
OCTEON_IS_MODEL(OCTEON_CN58XX)))
-        return res;
+        return -1;

      /* Callback to perform SPI4 reset */
      INVOKE_CB(cvmx_spi_callbacks.reset_cb, interface, mode);
@@ -130,7 +129,7 @@ int cvmx_spi_start_interface(int interface, 
cvmx_spi_mode_t mode, int timeout,
      /* Callback to handle interface coming up */
      INVOKE_CB(cvmx_spi_callbacks.interface_up_cb, interface, mode);

-    return res;
+    return -1;
  }

  /*