MIPS: Remove dead code in relocate_new_kernel

There are two adjacent "b" instructions, the second one is unreachable,
it is dead code, just remove it.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/kernel/relocate_kernel.S

@@ -66,7 +66,6 @@ copy_word:
 	LONG_ADDIU	s6, s6, -1
 	beq		s6, zero, process_entry
 	b		copy_word
-	b		process_entry
 
 done:
 #ifdef CONFIG_SMP