powerpc: Use the TRAP macro whenever comparing a trap number

Trap numbers can have extra bits at the bottom that need to
be filtered out. There are a few cases where we don't do that.

It's possible that we got lucky but better safe than sorry.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/mm/fault.c

@@ -571,7 +571,7 @@ void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig)
 
 	/* kernel has accessed a bad area */
 
-	switch (regs->trap) {
+	switch (TRAP(regs)) {
 	case 0x300:
 	case 0x380:
 		printk(KERN_ALERT "Unable to handle kernel paging request for "