avcodec/dvdsub: Fix warning about incompatible pointer type
Fixes "passing argument 2 of ‘strtoul’ from incompatible pointer type [-Wincompatible-pointer-types]" ("expected ‘char ** restrict’ but argument is of type ‘const char **’") for GCC and "passing 'const char **' to parameter of type 'char **' discards qualifiers in nested pointer types [-Wincompatible-pointer-types-discards-qualifiers]" for Clang. The cast itself is safe; it is only needed because strtoul itself is not const-correct. Signed-off-by:Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Reviewed-by:
Paul B Mahol <onemda@gmail.com> Signed-off-by:
James Almer <jamrial@gmail.com>
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