[patch] fix build error with -Werror=declaration-after-statement

[Matthias Klose <doko@ubuntu.com>]

seen while merging the 3.1 release into the python sources. The build fails when
built with -Werror=declaration-after-statement

  Matthias

diff -urN libffi-3.1/src/arm/ffi.c libffi/src/arm/ffi.c
--- libffi-3.1/src/arm/ffi.c    Sat Aug 09 23:52:34 2014 +0200
+++ libffi/src/arm/ffi.c        Sat Aug 09 23:58:38 2014 +0200
@@ -154,9 +154,6 @@

 int ffi_prep_args_VFP(char *stack, extended_cif *ecif, float *vfp_space)
 {
-  // make sure we are using FFI_VFP
-  FFI_ASSERT(ecif->cif->abi == FFI_VFP);
-
   register unsigned int i, vi = 0;
   register void **p_argv;
   register char *argp, *regp, *eo_regp;
@@ -165,6 +162,9 @@
   char done_with_regs = 0;
   char is_vfp_type;

+  // make sure we are using FFI_VFP
+  FFI_ASSERT(ecif->cif->abi == FFI_VFP);
+
   /* the first 4 words on the stack are used for values passed in core
    * registers. */
   regp = stack;