read/line: check for overflow when advancing the address #493

Job	Run time
coverage	1m 26s
build (ubuntu-latest, stable)	46s
bench	1m 3s
build (ubuntu-latest, beta)	49s
Build fuzz targets	1m 14s
build (ubuntu-latest, nightly)	44s
cross (i686-unknown-linux-gnu)	45s
build (stable, macOS-latest)	39s
cross (powerpc64-unknown-linux-gnu)	54s
doc	20s
features	3m 17s
msrv	1m 51s
msrv-read	1m 49s
rustfmt	10s
Run `debug_abbrev` fuzz target	5m 6s
Run `debug_aranges` fuzz target	5m 6s
Run `debug_info` fuzz target	5m 5s
Run `debug_line` fuzz target	5m 9s
Run `eh_frame` fuzz target	5m 5s
Run `eh_frame_hdr` fuzz target	5m 7s
	46m 25s

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