Fix x86 cfi directives for syscalls.

The syscall generation always used 4 bytes for each push cfi directive.
However, the first push should always use an offset of 8 bytes, each
subsequent push after that is only 4 bytes though.

Change-Id: Ibaabd107f399ef67010b9a08213783957c2f74a9
diff --git a/libc/arch-x86/syscalls/sched_setaffinity.S b/libc/arch-x86/syscalls/sched_setaffinity.S
index bd3d0ab..bb35259 100644
--- a/libc/arch-x86/syscalls/sched_setaffinity.S
+++ b/libc/arch-x86/syscalls/sched_setaffinity.S
@@ -4,12 +4,14 @@
 
 ENTRY(sched_setaffinity)
     pushl   %ebx
-    pushl   %ecx
-    pushl   %edx
-    .cfi_def_cfa_offset 12
+    .cfi_def_cfa_offset 8
     .cfi_rel_offset ebx, 0
-    .cfi_rel_offset ecx, 4
-    .cfi_rel_offset edx, 8
+    pushl   %ecx
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset ecx, 0
+    pushl   %edx
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset edx, 0
     mov     16(%esp), %ebx
     mov     20(%esp), %ecx
     mov     24(%esp), %edx