arm64: kexec: Fix missing error code 'ret' warning in load_other_segments()

mainline inclusion
from mainline-v5.16-rc6
commit 9c5d89bc
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4Y3UC

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9c5d89bc10551f1aecd768b00fca3339a7b8c8ee



--------------------------------

Since commit ac10be5c ("arm64: Use common
of_kexec_alloc_and_setup_fdt()"), smatch reports the following warning:

  arch/arm64/kernel/machine_kexec_file.c:152 load_other_segments()
  warn: missing error code 'ret'

Return code is not set to an error code in load_other_segments() when
of_kexec_alloc_and_setup_fdt() call returns a NULL dtb. This results
in status success (return code set to 0) being returned from
load_other_segments().

Set return code to -EINVAL if of_kexec_alloc_and_setup_fdt() returns
NULL dtb.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: ac10be5c ("arm64: Use common of_kexec_alloc_and_setup_fdt()")
Link: https://lore.kernel.org/r/20211210010121.101823-1-nramas@linux.microsoft.com


Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Li Huafei <lihuafei1@huawei.com>
Reviewed-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>