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libmp: simplify mpnrand(), as mpnew() cannot return nil

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

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

@@ -13,16 +13,11 @@

 	/* m = 2^bits - 1 */

 	bits = mpsignif(n);

 	m = mpnew(bits+1);

-	if(m == nil)

-		sysfatal("mpnrand: %r");

 	mpleft(mpone, bits, m);

 	mpsub(m, mpone, m);

-	if(b == nil){

+	if(b == nil)

 		b = mpnew(bits);

-		if(b == nil)

-			sysfatal("mpnrand: %r");

-	}

 	/* m = m - (m % n) */

 	mpmod(m, n, b);