api: handle reset() return in ColorConfig constructor

The ColorConfig constructor calls reset() without using the return value,
which triggers OIIO_NODISCARD_ERROR.
The error remains queryable via has_error(),
so adding a cast (void) to explicitly discard the return from reset().

Signed-off-by: Luna Kim <177369799+luna-y-kim@users.noreply.github.com>

Author: luna-y-kim

src/libOpenImageIO/color_ocio.cpp

@@ -807,7 +807,7 @@ ColorConfig::Impl::IdentifyBuiltinColorSpace(const char* name) const
 
 
 
-ColorConfig::ColorConfig(string_view filename) { reset(filename); }
+ColorConfig::ColorConfig(string_view filename) { (void)reset(filename); }