EFX: Add explicit cast to a square function

MSVC 2015 and above returns the expression according to its datatype.
In this case, returns 4294967295 instead of -1.

1 files changed, 1 insertions, 1 deletions

diff --git a/alc/effects/modulator.cpp b/alc/effects/modulator.cpp
index 23bae63f..aee896fb 100644
--- a/alc/effects/modulator.cpp
+++ b/alc/effects/modulator.cpp
@@ -52,7 +52,7 @@ inline float Saw(ALuint index)
 { return static_cast<float>(index)*(2.0f/WAVEFORM_FRACONE) - 1.0f; }
 
 inline float Square(ALuint index)
-{ return static_cast<float>(((index>>(WAVEFORM_FRACBITS-2))&2) - 1); }
+{ return static_cast<float>(static_cast<int>((index>>(WAVEFORM_FRACBITS-2))&2) - 1); }
 
 inline float One(ALuint) { return 1.0f; }