Fix two memory use errors detected by ASAN #182

Job	Run time
🚧 Build SPAdes	1m 38s
Multicell B.cereus TruSeq 100x	4m 42s
Nextera L.monocytogenes	1m 7s
Full run M.ruber JGI lane 9	5m 58s
IonTorrent E.coli K12	29m 23s
Single reads E.coli Deeptrench	1m 53s
plasmidSPAdes C.callunae	7m 38s
Saves E.coli UCSD lane 1	9m 28s
Mate-pairs B.faecium	2m 17s
PacBio M.ruber	4m 15s
Single-cell P.heparinus JGI lane 7	3m 3s
metaSPAdes JGI 150	15m 54s
Saves E.coli 100K	53s
metaviralSPAdes ERR525599	14m 50s
Contigs E.coli JGI lane 7	4m 14s
	1h 47m 13s

Provide feedback