[PATCH] x86/kdump: fix wrong judge about crash_size var

[Xin Hao <xhao@linux.alibaba.com>]

The type of crash_size is unsigned long long, so
it can not be less than 0, so there fix it.

Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
---
 arch/x86/kernel/setup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index bff3a784aec5..95b80ec11741 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -472,11 +472,11 @@ static void __init reserve_crashkernel(void)

 	/* crashkernel=XM */
 	ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
-	if (ret != 0 || crash_size <= 0) {
+	if (ret != 0 || !crash_size) {
 		/* crashkernel=X,high */
 		ret = parse_crashkernel_high(boot_command_line, total_mem,
 					     &crash_size, &crash_base);
-		if (ret != 0 || crash_size <= 0)
+		if (ret != 0 || !crash_size)
 			return;
 		high = true;
 	}
--
2.31.0