lsi: do not reset on error

Resetting on any error (including for example a disconnected device)
will cause a unit attention condition on all devices.  So if we cannot
probe for example target 6, the first read on target 0 will fail.

Reported-by: Frediano Ziglio <freddy77@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/src/lsi-scsi.c b/src/lsi-scsi.c
index 949d3f4..b70b3a5 100644
--- a/src/lsi-scsi.c
+++ b/src/lsi-scsi.c
@@ -115,8 +115,6 @@
     }
 
 fail:
-    // sledge hammer to get back into a known-good state: hba reset
-    outb(LSI_ISTAT0_SRST, iobase + LSI_REG_ISTAT0);
     return DISK_RET_EBADTRACK;
 }