sd: Fix out-of-bounds assertions

Due to an off-by-one error, the assert statements allow an
out-of-bound array access.  This doesn't happen in practice,
but the static analyzer notices.
Signed-off-by: NLidong Chen <lidong.chen@oracle.com>
Reviewed-by: NLiam Merwick <liam.merwick@oracle.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: NLi Qiang <liq3ea@gmail.com>
Reviewed-by: NDarren Kenny <darren.kenny@oracle.com>
Message-Id: <6b19cb7359a10a6bedc3ea0fce22fed3ef93c102.1560806687.git.lidong.chen@oracle.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/sd/sd.c

@@ -145,7 +145,7 @@ static const char *sd_state_name(enum SDCardStates state)
     if (state == sd_inactive_state) {
         return "inactive";
     }
-    assert(state <= ARRAY_SIZE(state_name));
+    assert(state < ARRAY_SIZE(state_name));
     return state_name[state];
 }
 
@@ -166,7 +166,7 @@ static const char *sd_response_name(sd_rsp_type_t rsp)
     if (rsp == sd_r1b) {
         rsp = sd_r1;
     }
-    assert(rsp <= ARRAY_SIZE(response_name));
+    assert(rsp < ARRAY_SIZE(response_name));
     return response_name[rsp];
 }