Fix compiler warnings

Change-Id: I2a97f08cc3c7808ce5be39e910cc5147ecf03a1d
diff --git a/vp8/vp8_cx_iface.c b/vp8/vp8_cx_iface.c
index 9c05a64..69d95d8 100644
--- a/vp8/vp8_cx_iface.c
+++ b/vp8/vp8_cx_iface.c
@@ -109,7 +109,7 @@
     } while(0)
 
 #define RANGE_CHECK(p,memb,lo,hi) do {\
-        if(!((p)->memb >= (lo) && (p)->memb <= hi)) \
+        if(!(((p)->memb == lo || (p)->memb > (lo)) && (p)->memb <= hi)) \
             ERROR(#memb " out of range ["#lo".."#hi"]");\
     } while(0)