Fix segv when unwinding stack past __libc_init.

This change mirrors cd15bac for statically-linked binaries.

Change-Id: Id870832a50b37f0ef3e79e1ed03ed31390bfc9ef
diff --git a/libc/arch-arm/bionic/crtbegin_static.S b/libc/arch-arm/bionic/crtbegin_static.S
index e62ac1d..087ce36 100644
--- a/libc/arch-arm/bionic/crtbegin_static.S
+++ b/libc/arch-arm/bionic/crtbegin_static.S
@@ -53,7 +53,9 @@
 	ldr	r2, =main
 	adr	r3, 1f
 	ldr	r4, =__libc_init
-	bx	r4
+	blx	r4
+	mov	r0, #0
+	bx	r0
 
 1:  .long   __PREINIT_ARRAY__
     .long   __INIT_ARRAY__