Merge branch 'ab/cocci-unused'

Add Coccinelle rules to detect the pattern of initializing and then finalizing a structure without using it in between at all, which happens after code restructuring and the compilers fail to recognize as an unused variable. * ab/cocci-unused: cocci: generalize "unused" rule to cover more than "strbuf" cocci: add and apply a rule to find "unused" strbufs cocci: have "coccicheck{,-pending}" depend on "coccicheck-test" cocci: add a "coccicheck-test" target and test *.cocci rules Makefile & .gitignore: ignore & clean "git.res", not "*.res" Makefile: remove mandatory "spatch" arguments from SPATCH_FLAGS