checkasm: add _fixed suffix to fixed_dsp tests

Should prevents future conflicts with the similarly named floatdsp tests

tests/checkasm/fixed_dsp.c

@@ -137,15 +137,15 @@ void checkasm_check_fixed_dsp(void)
     AVFixedDSPContext *fdsp = avpriv_alloc_fixed_dsp(1);
 
     randomize_buffers();
-    if (check_func(fdsp->vector_fmul, "vector_fmul"))
+    if (check_func(fdsp->vector_fmul, "vector_fmul_fixed"))
         check_vector_fmul(src0, src1);
-    if (check_func(fdsp->vector_fmul_add, "vector_fmul_add"))
+    if (check_func(fdsp->vector_fmul_add, "vector_fmul_add_fixed"))
         check_vector_fmul_add(src0, src1, src2);
-    if (check_func(fdsp->vector_fmul_reverse, "vector_fmul_reverse"))
+    if (check_func(fdsp->vector_fmul_reverse, "vector_fmul_reverse_fixed"))
         check_vector_fmul(src0, src1);
-    if (check_func(fdsp->vector_fmul_window, "vector_fmul_window"))
+    if (check_func(fdsp->vector_fmul_window, "vector_fmul_window_fixed"))
         check_vector_fmul_window(src0, src1, src2);
-    if (check_func(fdsp->vector_fmul_window_scaled, "vector_fmul_window_scaled"))
+    if (check_func(fdsp->vector_fmul_window_scaled, "vector_fmul_window_scaled_fixed"))
         check_vector_fmul_window_scaled(src0, src1, src2);
     report("vector_fmul");
     if (check_func(fdsp->butterflies_fixed, "butterflies_fixed"))