kexec-tools: Fix a prompt message when crashkernel is not reserved

Where Y specifies how much memory to reserve for the dump-capture kernel
and X specifies the beginning of this reserved memory. So Y should be
placed before X.

Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Reviewed-by: Bhupesh Sharma <bhsharma@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
diff --git a/kexec/kexec.c b/kexec/kexec.c
index bb88caa..fd7c8d2 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -1530,7 +1530,7 @@
 	    !is_crashkernel_mem_reserved()) {
 		die("Memory for crashkernel is not reserved\n"
 		    "Please reserve memory by passing"
-		    "\"crashkernel=X@Y\" parameter to kernel\n"
+		    "\"crashkernel=Y@X\" parameter to kernel\n"
 		    "Then try to loading kdump kernel\n");
 	}