elf64-s390.c: Fix -Werror=misleading-indentation

elf64-s390.c: Fix -Werror=misleading-indentation

../../bfd/elf64-s390.c: In function 'elf_s390_reloc_name_lookup':
../../bfd/elf64-s390.c:340:5: error: statement is indented as if it were guarded by... [-Werror=misleading-indentation]
     if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0)
     ^~
../../bfd/elf64-s390.c:333:3: note: ...this 'for' clause, but it is not
   for (i = 0;
   ^~~

bfd/
	* elf64-s390.c (elf_s390_reloc_name_lookup): Fix indentation.