riscv: vc1dsp: Don't check vlenb before checking the CPU flags

We can't call ff_get_rv_vlenb() if we don't have RVV available
at all.

Acked-by: Rémi Denis-Courmont <remi@remlab.net>
Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/riscv/vc1dsp_init.c

@@ -35,15 +35,13 @@ av_cold void ff_vc1dsp_init_riscv(VC1DSPContext *dsp)
 #if HAVE_RVV
     int flags = av_get_cpu_flags();
 
-    if (ff_get_rv_vlenb() >= 16) {
+    if (flags & AV_CPU_FLAG_RVV_I32 && ff_get_rv_vlenb() >= 16) {
+        dsp->vc1_inv_trans_4x8_dc = ff_vc1_inv_trans_4x8_dc_rvv;
+        dsp->vc1_inv_trans_4x4_dc = ff_vc1_inv_trans_4x4_dc_rvv;
         if (flags & AV_CPU_FLAG_RVV_I64) {
             dsp->vc1_inv_trans_8x8_dc = ff_vc1_inv_trans_8x8_dc_rvv;
             dsp->vc1_inv_trans_8x4_dc = ff_vc1_inv_trans_8x4_dc_rvv;
         }
-        if (flags & AV_CPU_FLAG_RVV_I32) {
-            dsp->vc1_inv_trans_4x8_dc = ff_vc1_inv_trans_4x8_dc_rvv;
-            dsp->vc1_inv_trans_4x4_dc = ff_vc1_inv_trans_4x4_dc_rvv;
-        }
     }
 #endif
 }