Fix a couple of casting warnings.

src/films/tiledhdrfilm.cpp

@@ -280,7 +280,7 @@ public:
 					Vector2i(m_blockSize, m_blockSize));
 		} else {
 			m_tile = new Bitmap(Bitmap::EMultiChannel, m_componentFormat,
-					Vector2i(m_blockSize, m_blockSize), m_channelNames.size());
+					Vector2i(m_blockSize, m_blockSize), (uint8_t) m_channelNames.size());
 			m_tile->setChannelNames(m_channelNames);
 		}
 

src/integrators/misc/field.cpp

@@ -165,7 +165,7 @@ public:
 				}
 				break;
 			case EPrimIndex:
-				result = Spectrum((int) its.primIndex);
+				result = Spectrum((Float) its.primIndex);
 				break;
 			default:
 				Log(EError, "Internal error!");