hash: spelling fix

ccan/hash/hash.c

@@ -741,7 +741,7 @@ void driver2()
     {
       for (j=0; j<8; ++j)   /*------------------------ for each input bit, */
       {
-	for (m=1; m<8; ++m) /*------------ for serveral possible initvals, */
+	for (m=1; m<8; ++m) /*------------ for several possible initvals, */
 	{
 	  for (l=0; l<HASHSTATE; ++l)
 	    e[l]=f[l]=g[l]=h[l]=x[l]=y[l]=~((uint32_t)0);