s390: Fix broken build

Fix this build error:

In file included from fs/exec.c:61:0:
arch/s390/include/asm/tlb.h:35:23: error: expected identifier or '(' before 'unsigned'
arch/s390/include/asm/tlb.h:36:1: warning: no semicolon at end of struct or union [enabled by default]
arch/s390/include/asm/tlb.h: In function 'tlb_gather_mmu':
arch/s390/include/asm/tlb.h:57:5: error: 'struct mmu_gather' has no member named 'end'

Broken due to commit 2b047252d0 ("Fix TLB gather virtual address range
invalidation corner cases").

Cc: Greg Kroah-Hartman <[e-mail]>
Cc: [e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
[ Oh well. We had build testing for ppc amd um, but no s390 - Linus ]
Signed-off-by: Linus Torvalds <[e-mail]>

arch/s390/include/asm/tlb.h

···
 	struct mm_struct *mm;
 	struct mmu_table_batch *batch;
 	unsigned int fullmm;
-	unsigned long start, unsigned long end;
+	unsigned long start, end;
 };
 
 struct mmu_table_batch {