Merge branch 'rs/strbuf-avoid-redundant-reset' into next

A redundant 'strbuf_reset()' call in the 'HAVE_GETDELIM' path of 'strbuf_getwholeline()' has been removed, as 'getdelim()' overwrites the buffer and the length is updated afterward. * rs/strbuf-avoid-redundant-reset: strbuf: avoid redundant reset in strbuf_getwholeline()