Fix invalid memory use #186

Job	Run time
🚧 Build SPAdes	3m 0s
Nextera L.monocytogenes	1m 15s
Multicell B.cereus TruSeq 100x	4m 29s
IonTorrent E.coli K12	29m 29s
Full run M.ruber JGI lane 9	5m 17s
Mate-pairs B.faecium	2m 18s
Saves E.coli UCSD lane 1	9m 32s
Single-cell P.heparinus JGI lane 7	2m 57s
plasmidSPAdes C.callunae	7m 21s
Single reads E.coli Deeptrench	1m 55s
PacBio M.ruber	4m 3s
Saves E.coli 100K	50s
metaSPAdes JGI 150	14m 48s
metaviralSPAdes ERR525599	14m 31s
Contigs E.coli JGI lane 7	3m 49s
	1h 45m 34s

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