parisc: remove obsolete manual allocation aligning in iosapic

kmalloc() returns memory with __assume_kmalloc_alignment, which is
__alignof__(unsigned long long) for parisc.
Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/parisc/iosapic.c

@@ -221,16 +221,7 @@ static size_t irt_num_entry;
 
 static struct irt_entry *iosapic_alloc_irt(int num_entries)
 {
-	unsigned long a;
-
-	/* The IRT needs to be 8-byte aligned for the PDC call. 
-	 * Normally kmalloc would guarantee larger alignment, but
-	 * if CONFIG_DEBUG_SLAB is enabled, then we can get only
-	 * 4-byte alignment on 32-bit kernels
-	 */
-	a = (unsigned long)kmalloc(sizeof(struct irt_entry) * num_entries + 8, GFP_KERNEL);
-	a = (a + 7UL) & ~7UL;
-	return (struct irt_entry *)a;
+	return kcalloc(num_entries, sizeof(struct irt_entry), GFP_KERNEL);
 }
 
 /**