Fix various function prototypes.

diff --git a/dlls/kernel/process.c b/dlls/kernel/process.c
index 1910d72..187d6bf 100644
--- a/dlls/kernel/process.c
+++ b/dlls/kernel/process.c
@@ -2599,7 +2599,7 @@
 /***********************************************************************
  *          SetProcessAffinityMask   (KERNEL32.@)
  */
-BOOL WINAPI SetProcessAffinityMask( HANDLE hProcess, DWORD affmask )
+BOOL WINAPI SetProcessAffinityMask( HANDLE hProcess, DWORD_PTR affmask )
 {
     BOOL ret;
     SERVER_START_REQ( set_process_info )