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libmp: fix assert() for mpexp() with nil modulus

--- a/sys/src/libmp/port/mpexp.c

+++ b/sys/src/libmp/port/mpexp.c

@@ -22,7 +22,7 @@

 	mpdigit d, bit;

 	int i, j;

-	assert(m->flags & MPnorm);

+	assert(m == nil || m->flags & MPnorm);

 	assert((e->flags & MPtimesafe) == 0);

 	res->flags |= b->flags & MPtimesafe;