Merge branch 'ab/grep-lose-opt-regflags'

Code cleanup. * ab/grep-lose-opt-regflags: grep: remove redundant REG_NEWLINE when compiling fixed regex grep: remove regflags from the public grep_opt API grep: remove redundant and verbose re-assignments to 0 grep: remove redundant "fixed" field re-assignment to 0 grep: adjust a redundant grep pattern type assignment grep: remove redundant double assignment to 0