s390/ioinst: fix IO_INT_WORD_ISC macro

The I/O-Interruption Subclass field corresponds to bits 2 to 5 (BE
notation) of the Interruption-Identification Word. The value should
be shift by 27 instead of 24.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Reviewed-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

target-s390x/ioinst.h

@@ -220,7 +220,7 @@ typedef struct IOIntCode {
 #define IOINST_SCHID_SSID(_schid)  ((_schid & 0x00060000) >> 17)
 #define IOINST_SCHID_NR(_schid)    (_schid & 0x0000ffff)
 
-#define IO_INT_WORD_ISC(_int_word) ((_int_word & 0x38000000) >> 24)
+#define IO_INT_WORD_ISC(_int_word) ((_int_word & 0x38000000) >> 27)
 #define ISC_TO_ISC_BITS(_isc)      ((0x80 >> _isc) << 24)
 
 #define IO_INT_WORD_AI 0x80000000