[PARISC] Minor iosapic.c cleanup

minor cleanup: qualify constant with "UL"
Acked-by: N"Hmamouche, Youssef" <youssef@ece.utexas.edu>
Signed-off-by: NGrant Grundler <grundler@parisc-linux.org>
Signed-off-by: NKyle McMartin <kyle@parisc-linux.org>

drivers/parisc/iosapic.c

@@ -244,7 +244,7 @@ static struct irt_entry *iosapic_alloc_irt(int num_entries)
 	 * 4-byte alignment on 32-bit kernels
 	 */
 	a = (unsigned long)kmalloc(sizeof(struct irt_entry) * num_entries + 8, GFP_KERNEL);
-	a = (a + 7) & ~7;
+	a = (a + 7UL) & ~7UL;
 	return (struct irt_entry *)a;
 }