sdcard: simplify SEND_IF_COND (CMD8)

replace switch(single case) -> if()
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NAlistair Francis <alistair.francis@xilinx.com>
Message-id: 20180215221325.7611-16-f4bug@amsat.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/sd/sd.c

@@ -1008,8 +1008,9 @@ static sd_rsp_type_t sd_normal_command(SDState *sd,
 
     case 8:	/* CMD8:   SEND_IF_COND */
         /* Physical Layer Specification Version 2.00 command */
-        switch (sd->state) {
-        case sd_idle_state:
+        if (sd->state != sd_idle_state) {
+            break;
+        }
         sd->vhs = 0;
 
         /* No response if not exactly one VHS bit is set.  */
@@ -1021,11 +1022,6 @@ static sd_rsp_type_t sd_normal_command(SDState *sd,
         sd->vhs = req.arg;
         return sd_r7;
 
-        default:
-            break;
-        }
-        break;
-
     case 9:	/* CMD9:   SEND_CSD */
         switch (sd->state) {
         case sd_standby_state: