user32: Use BOOL type where appropriate.

dlls/user32/cursoricon.c

@@ -1100,7 +1100,8 @@ static HCURSOR CURSORICON_CreateIconFromANI( const BYTE *bits, DWORD bits_size,
     ani_header header = {0};
     BOOL use_seq = FALSE;
     HCURSOR cursor = 0;
-    UINT i, error = 0;
+    UINT i;
+    BOOL error = FALSE;
     HICON *frames;
 
     riff_chunk_t root_chunk = { bits_size, bits };

dlls/user32/message.c

@@ -4205,7 +4205,7 @@ typedef struct BroadcastParm
     UINT msg;
     WPARAM wp;
     LPARAM lp;
-    DWORD success;
+    BOOL success;
     HWINSTA winsta;
 } BroadcastParm;
 
@@ -4246,7 +4246,7 @@ static BOOL CALLBACK bcast_childwindow( HWND hw, LPARAM lp )
         return TRUE;
 
 fail:
-        parm->success = 0;
+        parm->success = FALSE;
         return FALSE;
     }
     else if (parm->flags & BSF_POSTMESSAGE)