Get rid of HeapAlloc casts.

dlls/winmm/wineoss/dscapture.c

diff --git a/dlls/winmm/wineoss/dscapture.c b/dlls/winmm/wineoss/dscapture.c
index a1c695e..3d672aa 100644
--- a/dlls/winmm/wineoss/dscapture.c
+++ b/dlls/winmm/wineoss/dscapture.c
@@ -1239,7 +1239,7 @@
     IDsCaptureDriverPropertySetImpl * dscdps;
     TRACE("(%p,%p)\n",dscdb,pdscdps);
 
-    dscdps = (IDsCaptureDriverPropertySetImpl*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(dscdps));
+    dscdps = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(dscdps));
     if (dscdps == NULL) {
         WARN("out of memory\n");
         return DSERR_OUTOFMEMORY;
@@ -1262,7 +1262,7 @@
     IDsCaptureDriverNotifyImpl * dscdn;
     TRACE("(%p,%p)\n",dscdb,pdscdn);
 
-    dscdn = (IDsCaptureDriverNotifyImpl*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(dscdn));
+    dscdn = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(dscdn));
     if (dscdn == NULL) {
         WARN("out of memory\n");
         return DSERR_OUTOFMEMORY;
@@ -1291,7 +1291,7 @@
         return MMSYSERR_NOTSUPPORTED;
     }
 
-    *idrv = (IDsCaptureDriverImpl*)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(IDsCaptureDriverImpl));
+    *idrv = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(IDsCaptureDriverImpl));
     if (!*idrv)
         return MMSYSERR_NOMEM;
     (*idrv)->lpVtbl	= &dscdvt;

dlls/winmm/wineoss/dsrender.c

diff --git a/dlls/winmm/wineoss/dsrender.c b/dlls/winmm/wineoss/dsrender.c
index 4b41742..4cbae15 100644
--- a/dlls/winmm/wineoss/dsrender.c
+++ b/dlls/winmm/wineoss/dsrender.c
@@ -786,7 +786,7 @@
     if (dwFlags & (DSBCAPS_CTRLFREQUENCY | DSBCAPS_CTRLPAN))
 	return DSERR_CONTROLUNAVAIL;
 
-    *ippdsdb = (IDsDriverBufferImpl*)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(IDsDriverBufferImpl));
+    *ippdsdb = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(IDsDriverBufferImpl));
     if (*ippdsdb == NULL)
 	return DSERR_OUTOFMEMORY;
     (*ippdsdb)->lpVtbl  = &dsdbvt;
@@ -894,7 +894,7 @@
     IDsDriverPropertySetImpl * dsdps;
     TRACE("(%p,%p)\n",dsdb,pdsdps);
 
-    dsdps = (IDsDriverPropertySetImpl*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(dsdps));
+    dsdps = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(dsdps));
     if (dsdps == NULL) {
         WARN("out of memory\n");
         return DSERR_OUTOFMEMORY;
@@ -917,7 +917,7 @@
     IDsDriverNotifyImpl * dsdn;
     TRACE("(%p,%p)\n",dsdb,pdsdn);
 
-    dsdn = (IDsDriverNotifyImpl*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(dsdn));
+    dsdn = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(dsdn));
 
     if (dsdn == NULL) {
         WARN("out of memory\n");
@@ -947,7 +947,7 @@
 	return MMSYSERR_NOTSUPPORTED;
     }
 
-    *idrv = (IDsDriverImpl*)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(IDsDriverImpl));
+    *idrv = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(IDsDriverImpl));
     if (!*idrv)
 	return MMSYSERR_NOMEM;
     (*idrv)->lpVtbl          = &dsdvt;