if no hwconfig variable is defined for a platform and we try to get the
subarg of hwconfig, we receive a warning:
WARNING: Calling __hwconfig without a buffer and before environment is ready

Therefore, if hwconfig is not found return without further processing.

Signed-off-by: Pankaj Bansal <pankaj.ban...@nxp.com>
---

Notes:
    V2:
    - Add copyright year in file that has been updated

 arch/arm/cpu/armv8/fsl-layerscape/cpu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c 
b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
index 8fd6c751c6..b42beca6e1 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Copyright 2017 NXP
+ * Copyright 2017, 2019 NXP
  * Copyright 2014-2015 Freescale Semiconductor, Inc.
  */
 
@@ -1072,6 +1072,8 @@ static void config_core_prefetch(void)
 
        if (env_get_f("hwconfig", buffer, sizeof(buffer)) > 0)
                buf = buffer;
+       else
+               return;
 
        prefetch_arg = hwconfig_subarg_f("core_prefetch", "disable",
                                         &arglen, buf);
-- 
2.17.1

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