Rename wtap_dump_file_write_all() to wtap_dump_file_write(), and have

everybody use it; the places using the old wtap_dump_file_write() were
using it in the same way the old wtap_dump_file_write_all() did.

That also lets us get rid of wtap_dump_file_ferror().

Also, have the new wtap_dump_file_write() check for errors from
gzwrite() and fwrite() differently - the former returns 0 on error, the
latter can return a short write on error.

svn path=/trunk/; revision=33113

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