bfd/elf64-ppc.c: fix clang -Wbitwise-instead-of-logical warning in ppc64_elf_check_in...

bfd/elf64-ppc.c: fix clang -Wbitwise-instead-of-logical warning in ppc64_elf_check_init_fini

I see this error with clang-14:

      CC       elf64-ppc.lo
    /home/smarchi/src/binutils-gdb/bfd/elf64-ppc.c:13131:11: error: use of bitwise '&' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
      return (check_pasted_section (info, ".init")
             ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fix by replacing & with &&.  But given that the check_pasted_section
function has side-effects and we want to make sure both calls are made,
assign to temporary variables before evaluating the `&&`.

Change-Id: I849e1b2401bea5f4d8ef3ab9af99ba9e3ef42490