aarch64: fix rt_sigreturn decoding

* sigreturn.c (sys_sigreturn) [AARCH64]: Fix personality check.
diff --git a/sigreturn.c b/sigreturn.c
index 648bd0a..c253a0c 100644
--- a/sigreturn.c
+++ b/sigreturn.c
@@ -23,7 +23,7 @@
 # define OFFSETOF_STRUCT_UCONTEXT_UC_SIGMASK (5 * 4 + SIZEOF_STRUCT_SIGCONTEXT)
 		const long addr =
 # ifdef AARCH64
-			current_personality == 0 ?
+			current_personality == 1 ?
 				(*aarch64_sp_ptr + SIZEOF_STRUCT_SIGINFO +
 				 offsetof(struct ucontext, uc_sigmask)) :
 # endif