tests/fate/mp3: increase mp3-float-extra_overread FUZZ for ppc64be-RHEL7.0-gcc-4.8.2-ibmcrl to 23 from 20

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

tests/fate/mp3.mak

@@ -34,7 +34,7 @@ $(FATE_MP3): CMP = oneoff
 $(FATE_MP3): CMP_UNIT = f32
 $(FATE_MP3): FUZZ = 18
 
-fate-mp3-float-extra_overread: FUZZ = 20
+fate-mp3-float-extra_overread: FUZZ = 23
 
 FATE_MP3-$(call DEMDEC, MP3, MP3FLOAT) += $(FATE_MP3)