msacm32: Remove unneeded casts

[Andrew Talbot]

Changelog:
    msacm32: Remove unneeded casts.

diff --git a/dlls/msacm32/driver.c b/dlls/msacm32/driver.c
index 086eef2..481daf0 100644
--- a/dlls/msacm32/driver.c
+++ b/dlls/msacm32/driver.c
@@ -299,7 +299,7 @@ MMRESULT WINAPI acmDriverDetailsW(HACMDRIVERID hadid, PACMDRIVERDETAILSW padd, D
     if (mmr == MMSYSERR_NOERROR) {
         ACMDRIVERDETAILSW paddw;
         paddw.cbStruct = sizeof(paddw);
-        mmr = (MMRESULT)MSACM_Message(acmDrvr, ACMDM_DRIVER_DETAILS, (LPARAM)&paddw,  0);
+        mmr = MSACM_Message(acmDrvr, ACMDM_DRIVER_DETAILS, (LPARAM)&paddw,  0);
 
 	acmDriverClose(acmDrvr, 0);
         paddw.cbStruct = min(padd->cbStruct, sizeof(*padd));
diff --git a/dlls/msacm32/pcmconverter.c b/dlls/msacm32/pcmconverter.c
index 4b8fdfe..62c359c 100644
--- a/dlls/msacm32/pcmconverter.c
+++ b/dlls/msacm32/pcmconverter.c
@@ -1006,8 +1006,8 @@ static LRESULT PCM_StreamConvert(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMHEADER
     if (adsi->fdwDriver & PCM_RESAMPLE) {
 	DWORD	nsrc2 = nsrc;
 	DWORD	ndst2 = ndst;
-	apd->cvt.cvtChangeRate((DWORD)adsi->pwfxSrc->nSamplesPerSec, adsh->pbSrc, &nsrc2,
-			       (DWORD)adsi->pwfxDst->nSamplesPerSec, adsh->pbDst, &ndst2);
+	apd->cvt.cvtChangeRate(adsi->pwfxSrc->nSamplesPerSec, adsh->pbSrc, &nsrc2,
+			       adsi->pwfxDst->nSamplesPerSec, adsh->pbDst, &ndst2);
 	nsrc -= nsrc2;
 	ndst -= ndst2;
     } else {