ahci: fix host register max address

Yes, comment, it ought to be 0x2C.
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180531222835.16558-11-jsnow@redhat.com
Signed-off-by: NJohn Snow <jsnow@redhat.com>

hw/ide/ahci_internal.h

@@ -224,8 +224,7 @@ enum AHCIPortIRQ {
 #define SATA_SIGNATURE_CDROM               0xeb140101
 #define SATA_SIGNATURE_DISK                0x00000101
 
-#define AHCI_GENERIC_HOST_CONTROL_REGS_MAX_ADDR 0x20
-                                            /* Shouldn't this be 0x2c? */
+#define AHCI_GENERIC_HOST_CONTROL_REGS_MAX_ADDR 0x2c
 
 #define AHCI_PORT_REGS_START_ADDR          0x100
 #define AHCI_PORT_ADDR_OFFSET_MASK         0x7f