MIPS: Cleanup CONFIG_DEBUG_STACK_USAGE version of alloc_thread_info.

Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/thread_info.h

@@ -86,14 +86,7 @@ register struct thread_info *__current_thread_info __asm__("$28");
 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
 
 #ifdef CONFIG_DEBUG_STACK_USAGE
-#define alloc_thread_info(tsk)					\
-({								\
-	struct thread_info *ret;				\
-								\
-	ret = kzalloc(THREAD_SIZE, GFP_KERNEL);			\
-								\
-	ret;							\
-})
+#define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL)
 #else
 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
 #endif