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Code cleanup. * skip.c (skip_function_command, skip_file_command, skip_info): Remove unused forward declarations. (skip_file_command): Make variables symtab and filename targets const. Use proper 0 vs. NULL constant everywhere. (skip_function_command): Use proper 0 vs. NULL constant everywhere. Include empty line after declarations. Use GNU spacing in a comment. Do not use strlen for end of string check. (skip_info): Use proper 0 vs. NULL constant everywhere. Add column 5 comments. (skip_enable_command, skip_disable_command, skip_delete_command) (add_skiplist_entry): Use proper 0 vs. NULL constant everywhere. (function_pc_is_marked_for_skip): Make variable filename target const. Use proper 0 vs. NULL constant everywhere. Fix GNU non-compliant comment formatting. (skip_re_set): Add empty line after function comment. Use proper 0 vs. NULL constant everywhere. Include empty line after declarations. Make variable symtab target const. Do not use strlen for end of string check. gdb/doc/ * gdbint.texinfo (Coding Standards) (C Usage): New rule for 0 vs. NULL.