Fix depth sanity test in PixelFormat

common/rfb/PixelFormat.cxx

@@ -679,7 +679,7 @@ bool PixelFormat::isSane(void)
     return false;
 
   totalBits = bits(redMax) + bits(greenMax) + bits(blueMax);
-  if (totalBits > bpp)
+  if (totalBits > depth)
     return false;
 
   if (((redMax << redShift) & (greenMax << greenShift)) != 0)

tests/unit/pixelformat.cxx

@@ -104,6 +104,10 @@ int main(int argc, char** argv)
     doTest(true, 32, 24, false, true, 127, 511, 127, 0, 4, 20);
     doTest(true, 32, 24, false, true, 127, 127, 511, 0, 4, 8);
 
+    /* Insufficient depth */
+
+    doTest(true, 32, 16, false, true, 255, 255, 255, 0, 8, 16);
+
     /* Overlapping channels */
 
     doTest(true, 32, 24, false, true, 255, 255, 255, 0, 7, 16);