nvmem: brcm_nvram: Add check for kzalloc

Add the check for the return value of kzalloc in order to avoid
NULL pointer dereference.

Fixes: 6e977eaa82 ("nvmem: brcm_nvram: parse NVRAM content into NVMEM cells")
Cc: stable@vger.kernel.org
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230127104015.23839-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/brcm_nvram.c

@@ -98,6 +98,9 @@ static int brcm_nvram_parse(struct brcm_nvram *priv)
 	len = le32_to_cpu(header.len);
 
 	data = kzalloc(len, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
 	memcpy_fromio(data, priv->base, len);
 	data[len - 1] = '\0';