Fixed warnings.

Author: bkaradzic

tests/uint32_test.cpp

@@ -39,7 +39,7 @@ TEST_CASE("uint32_cnt")
 	REQUIRE(16 == bx::uint32_cnttz<uint16_t>(0) );
 	REQUIRE( 0 == bx::uint32_cnttz<uint32_t>(1) );
 	REQUIRE(32 == bx::uint32_cnttz<uint32_t>(0) );
-	REQUIRE(31 == bx::uint32_cnttz<uint32_t>(1<<31) );
+	REQUIRE(31 == bx::uint32_cnttz<uint32_t>(1u<<31) );
 	REQUIRE( 0 == bx::uint32_cnttz<uint64_t>(1) );
 	REQUIRE(64 == bx::uint32_cnttz<uint64_t>(0) );
 

tests/vsnprintf_test.cpp

@@ -181,7 +181,7 @@ TEST_CASE("vsnprintf s")
 
 TEST_CASE("vsnprintf t")
 {
-	size_t size = -1;
+	size_t size = size_t(-1);
 
 	REQUIRE(test("-1", "%td", size) );