Fix warnings.

src/nvmath/Random.cpp

@@ -15,7 +15,7 @@ const uint16 Rand48::c0 = 0x000B;
 /// Get a random seed based on the current time.
 uint Rand::randomSeed()
 {
-	return time(NULL);
+	return (uint)time(NULL);
 }
 
 

src/nvmath/SphericalHarmonic.cpp

@@ -64,7 +64,7 @@ namespace
 	
 		// Rule 2 needs no previous results
 		if (l == m) {
-			return powf(-1.0f, m) * doubleFactorial(2 * m - 1) * powf(1 - x*x, 0.5f * m);
+			return powf(-1.0f, float(m)) * doubleFactorial(2 * m - 1) * powf(1 - x*x, 0.5f * m);
 		}
 	
 		// Rule 3 requires the result for the same argument of the previous band