Fix warning introduced in 2c9e3ec9

Change-Id: I42bef21b2cc7274f107e5455dea1e382d8a419f4
diff --git a/modules/gles31/functional/es31fPrimitiveBoundingBoxTests.cpp b/modules/gles31/functional/es31fPrimitiveBoundingBoxTests.cpp
index fadeb4b..01cefc8 100644
--- a/modules/gles31/functional/es31fPrimitiveBoundingBoxTests.cpp
+++ b/modules/gles31/functional/es31fPrimitiveBoundingBoxTests.cpp
@@ -2194,7 +2194,7 @@
 			<< "Missed pixels: " << missedPixels
 			<< tcu::TestLog::EndMessage;
 		// allow 10% missing pixels for warning
-		if (missedPixels <= deRoundFloatToInt32(totalPixels * 0.1f))
+		if (missedPixels <= deRoundFloatToInt32((float)totalPixels * 0.1f))
 			errorMask = SCANRESULT_LINE_CONT_WARN_BIT;
 		else
 			errorMask =  SCANRESULT_LINE_CONT_ERR_BIT;