kexec: loongarch: fix load command line segment error

When kernel cmdline reserved multiple crash kernel segments, like:
"crashkernel=4G,high crashkernel=256M,low".
Cmdline segment may be loaded in locations larger than 4G of memory.
So the parameter 'buf_max' of add_buffer function should be
'hole_max'.

Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn>
Signed-off-by: Ming Wang <wangming01@loongson.cn>
Signed-off-by: Simon Horman <horms@kernel.org>

kexec/arch/loongarch/kexec-loongarch.c

@@ -337,7 +337,7 @@ int loongarch_load_other_segments(struct kexec_info *info, unsigned long hole_mi
 	cmdline[sizeof(cmdline) - 1] = 0;
 	add_buffer(info, cmdline, sizeof(cmdline), sizeof(cmdline),
 		sizeof(void *), _ALIGN_UP(hole_min, getpagesize()),
-		0xffffffff, 1);
+		hole_max, 1);
 
 	dbgprintf("%s:%d: command_line: %s\n", __func__, __LINE__, cmdline);