libc: Move FORTIFY into one file; make style fixups

This addresses post-commit feedback from
I88c39ca166bacde0b692aa3063e743bb046a5d2f. With this, our FORTIFY impl
now sits in one file.

Bug: 12231437
Test: mma; no new CtsBionicTestCases failures on bullhead internal
master.
Change-Id: I6f9ff81c3e86cf9d6a0efa650eb5765f1e2fa09c
diff --git a/libc/arch-arm/generic/bionic/__memcpy_chk.S b/libc/arch-arm/generic/bionic/__memcpy_chk.S
index 7044e5f..7ee2a8f 100644
--- a/libc/arch-arm/generic/bionic/__memcpy_chk.S
+++ b/libc/arch-arm/generic/bionic/__memcpy_chk.S
@@ -28,16 +28,16 @@
 
 #include <private/bionic_asm.h>
 
-         .syntax unified
+  .syntax unified
 
 ENTRY(__memcpy_chk)
-        cmp         r2, r3
-        bls         memcpy
+  cmp         r2, r3
+  bls         memcpy
 
-        // Preserve lr for backtrace.
-        push        {lr}
-        .cfi_def_cfa_offset 4
-        .cfi_rel_offset lr, 0
+  // Preserve lr for backtrace.
+  push        {lr}
+  .cfi_def_cfa_offset 4
+  .cfi_rel_offset lr, 0
 
-        bl          __memcpy_chk_fail
+  bl          __memcpy_chk_fail
 END(__memcpy_chk)