avcodec/x86/vp9dsp_init: Fix mix of declaration and statement

Reviewed-by: "Ronald S. Bultje" <rsbultje@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/x86/vp9dsp_init.c

@@ -309,10 +309,11 @@ ipred_func(32, tm, avx2);
 
 av_cold void ff_vp9dsp_init_x86(VP9DSPContext *dsp, int bpp)
 {
+#if HAVE_YASM
+    int cpu_flags;
     if (bpp != 8) return;
 
-#if HAVE_YASM
-    int cpu_flags = av_get_cpu_flags();
+    cpu_flags = av_get_cpu_flags();
 
 #define init_fpel(idx1, idx2, sz, type, opt) \
     dsp->mc[idx1][FILTER_8TAP_SMOOTH ][idx2][0][0] = \