pstore/ram: fix error return code in ramoops_probe()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NTony Luck <tony.luck@intel.com>

fs/pstore/ram.c

@@ -429,6 +429,7 @@ static int ramoops_probe(struct platform_device *pdev)
 		pr_err("memory size too small, minimum is %zu\n",
 			cxt->console_size + cxt->record_size +
 			cxt->ftrace_size);
+		err = -EINVAL;
 		goto fail_cnt;
 	}
 
@@ -446,6 +447,7 @@ static int ramoops_probe(struct platform_device *pdev)
 	spin_lock_init(&cxt->pstore.buf_lock);
 	if (!cxt->pstore.buf) {
 		pr_err("cannot allocate pstore buffer\n");
+		err = -ENOMEM;
 		goto fail_clear;
 	}