bug#30785: Man pages truncated, repeated

[Danny Milosavljevic]

set_current_prefix() searches for the current program executable file in $PATH,
and it can fail and return 0. 

In that case, relocatep will probably segfault at the location marked below:

>   char *relocated_path = new char[curr_prefix_len + relative_path_len + 1];
>   strcpy(relocated_path, curr_prefix);
                           ^^^^^^^^^^^

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