Added VA_STATUS_ERROR_SURFACE_IN_DISPLAYING

Overlay may be used for vaPutSurface, in this case, vaSyncSurface can
return VA_STATUS_ERROR_SURFACE_IN_DISPLAYING to indication a failure
Signed-off-by: Austin Yuan <shengquan.yuan@intel.com>

src/va.c

@@ -313,6 +313,8 @@ const char *vaErrorStr(VAStatus error_status)
             return "resolution not supported";
         case VA_STATUS_ERROR_UNIMPLEMENTED:
             return "the requested function is not implemented";
+        case VA_STATUS_ERROR_SURFACE_IN_DISPLAYING:
+            return "surface is in displaying (may by overlay)" ;
         case VA_STATUS_ERROR_UNKNOWN:
             return "unknown libva error";
     }

src/va.h

@@ -127,7 +127,8 @@ typedef int VAStatus;	/* Return status type from functions */
 #define VA_STATUS_ERROR_FLAG_NOT_SUPPORTED      0x00000011
 #define VA_STATUS_ERROR_INVALID_PARAMETER	0x00000012
 #define VA_STATUS_ERROR_RESOLUTION_NOT_SUPPORTED 0x00000013
-#define VA_STATUS_ERROR_UNIMPLEMENTED           0x00000014    
+#define VA_STATUS_ERROR_UNIMPLEMENTED           0x00000014
+#define VA_STATUS_ERROR_SURFACE_IN_DISPLAYING   0x00000015
 #define VA_STATUS_ERROR_UNKNOWN			0xFFFFFFFF
 
 /*