lib/test_kho: check if KHO is enabled

We must check whether KHO is enabled prior to issuing KHO commands,
otherwise KHO internal data structures are not initialized.

Link: https://lkml.kernel.org/r/20251106220635.2608494-1-pasha.tatashin@soleen.com
Fixes: b753522 ("kho: add test for kexec handover")
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202511061629.e242724-lkp@intel.com
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: soleen

lib/test_kho.c

@@ -301,6 +301,9 @@ static int __init kho_test_init(void)
 	phys_addr_t fdt_phys;
 	int err;
 
+	if (!kho_is_enabled())
+		return 0;
+
 	err = kho_retrieve_subtree(KHO_TEST_FDT, &fdt_phys);
 	if (!err)
 		return kho_test_restore(fdt_phys);