avf_showwaves: fix null pointer dereference
Michael Niedermayer authored
Found-by: durandal_1707
Signed-off-by: default avatarMichael Niedermayer <michaelni@gmx.at>
(cherry picked from commit e4eebc2d

)
Signed-off-by: default avatarMichael Niedermayer <michaelni@gmx.at>
78526c27
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