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sdmmc: switch argument must be integer

--- a/sys/src/9/port/sdmmc.c

+++ b/sys/src/9/port/sdmmc.c

@@ -269,7 +269,7 @@

 				break;

 			readextcsd(card);

 #define EXT_CSD(end, start) rbytes(card->ext_csd, start, (end)-(start)+1)

-			switch(EXT_CSD(192, 192)){

+			switch((uchar)EXT_CSD(192, 192)){

 			case 8:

 				card->specver = 510;	/* 5.1 */

 				break;