If CONFIG_HWCONFIG is disabled, hwconfig_subarg_f() will return the
empty string, ie. not NULL. Therefore, we have to check the returned
argument length as well as the return value.

Signed-off-by: Michael Walle <mich...@walle.cc>
---
 arch/arm/cpu/armv8/fsl-layerscape/cpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c 
b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
index a5d0b5370f..4bb73b524c 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
@@ -1073,7 +1073,7 @@ static void config_core_prefetch(void)
        prefetch_arg = hwconfig_subarg_f("core_prefetch", "disable",
                                         &arglen, buf);
 
-       if (prefetch_arg) {
+       if (arglen && prefetch_arg) {
                mask = simple_strtoul(prefetch_arg, NULL, 0) & 0xff;
                if (mask & 0x1) {
                        printf("Core0 prefetch can't be disabled\n");
-- 
2.20.1

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