powerpc/ps3: Fix system hang with GCC 5 builds

GCC 5 generates different code for this bootwrapper null check that
causes the PS3 to hang very early in its bootup. This check is of
limited value, so just get rid of it.

Cc: [e-mail]
Signed-off-by: Geoff Levand <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>

arch/powerpc/boot/ps3-head.S

···
 	bctr
 
 1:
-	/* Save the value at addr zero for a null pointer write check later. */
-
-	li	r4, 0
-	lwz	r3, 0(r4)
-
 	/* Primary delays then goes to _zimage_start in wrapper. */
 
 	or	31, 31, 31 /* db16cyc */

arch/powerpc/boot/ps3.c

···
 	flush_cache((void *)0x100, 512);
 }
 
-void platform_init(unsigned long null_check)
+void platform_init(void)
 {
 	const u32 heapsize = 0x1000000 - (u32)_end; /* 16MiB */
 	void *chosen;
 	unsigned long ft_addr;
 	u64 rm_size;
-	unsigned long val;
 
 	console_ops.write = ps3_console_write;
 	platform_ops.exit = ps3_exit;
···
 	ps3_copy_vectors();
 
 	printf(" flat tree at 0x%lx\n\r", ft_addr);
-
-	val = *(unsigned long *)0;
-
-	if (val != null_check)
-		printf("null check failed: %lx != %lx\n\r", val, null_check);
 
 	((kernel_entry_t)0)(ft_addr, 0, NULL);