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process crash with crafted request #5387
While building some regress tests for my mapfile, i wrongly passed twice one of the WMS arguments in the querystring, resulting in pretty bad memory corruptions/double-free on exit. Memory corruptions seems to be random, but happens much more with many layers in the mapfile (34 in my tests).
That's with mapserver 7.0.4 on OpenBSD/amd64, but i also saw this with 6.4.2 and 7.0.4 on Debian Jessie. PR to fix this in a few.