crash: fix spelling mistake "crahskernel" -> "crashkernel"

There is a spelling mistake in a pr_warn message. Fix it.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Colin Ian King <[e-mail]>
Acked-by: Baoquan He <[e-mail]>
Cc: Dave Young <[e-mail]>
Cc: Vivek Goyal <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

kernel/crash_reserve.c

···
 			cur++;
 			*crash_base = memparse(cur, &tmp);
 			if (cur == tmp) {
-				pr_warn("crahskernel: Memory value expected after '@'\n");
+				pr_warn("crashkernel: Memory value expected after '@'\n");
 				return -EINVAL;
 			}
 		}