Fixes clang warning:
```
../dlls/dsound/dsound_convert.c:145:23: warning: implicit conversion from 'int' to 'float' changes value from 2147483647 to 2147483648 [-Wimplicit-const-int-float-conversion]
if(value >= 1.f * 0x7FFFFFFF / 0x80000000U) /* this rounds to 1.f */
~ ^~~~~~~~~~
```
--
https://gitlab.winehq.org/wine/wine/-/merge_requests/5062