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mptod: fix the confusion with Dbits vs the actual type of v (uint64_t)

--- a/3rd/mp/mptod.c

+++ b/3rd/mp/mptod.c

@@ -31,12 +31,9 @@

 		else

 			w = a->p[i];

 		m = 54 - n;

-		if(m > Dbits){

+		if(m > Dbits)

 			m = Dbits;

-			v = 0;

-		}else{

-			v <<= m;

-		}

+		v = m < 64 ? (v<<m) : 0;

 		s = (Dbits - m) & (Dbits - 1);

 		v |= w >> s;

 		r = w & ((1ULL<<s) - 1);