hw/sd.c: Add missing state change for SD_STATUS, SEND_NUM_WR_BLOCKS

The SD_STATUS and SEND_NUM_WR_BLOCKS commands are supposed to cause
the card to send data back to the host. However sd.c was missing the
state change to sd_sendingdata_state for these commands, with the effect
that the Linux driver would either hang indefinitely waiting for
nonexistent data (pl181) or read zeroes and provoke a qemu warning
message (omap).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

hw/sd.c

@@ -1168,6 +1168,7 @@ static sd_rsp_type_t sd_app_command(SDState *sd,
     case 13:	/* ACMD13: SD_STATUS */
         switch (sd->state) {
         case sd_transfer_state:
+            sd->state = sd_sendingdata_state;
             sd->data_start = 0;
             sd->data_offset = 0;
             return sd_r1;
@@ -1182,6 +1183,7 @@ static sd_rsp_type_t sd_app_command(SDState *sd,
         case sd_transfer_state:
             *(uint32_t *) sd->data = sd->blk_written;
 
+            sd->state = sd_sendingdata_state;
             sd->data_start = 0;
             sd->data_offset = 0;
             return sd_r1;