avresample/x86: Switch operand order for mulps

With the forthcoming VEX instruction emulation, mulps
must have only the third operand point to memory, as
this is what vmulps expects.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

libavresample/x86/audio_mix.asm

@@ -422,7 +422,7 @@ cglobal mix_%1_to_%2_%3_flt, 3,in_channels+2,needed_mmregs+matrix_elements_mm, n
     %if stereo || mx_stack_0_0
     mulps          m0, m0, mx_0_0
     %else
-    mulps          m0, [src0q+lenq], mx_0_0
+    mulps          m0, mx_0_0, [src0q+lenq]
     %endif
 %assign %%i 1
 %rep (in_channels - 1)