chore: update C implementation

Author: Neerajpathak07

lib/node_modules/@stdlib/stats/base/dists/poisson/entropy/src/main.c

@@ -51,7 +51,6 @@ double stdlib_base_dists_poisson_entropy( const double lambda ) {
 	// Compute: sum_{k=2}^{inf} lambda^k * ln(k!) / k!
 	// k starts at 1, lk = lambda^1, first iteration makes k=2, lk=lambda^2
 	sum = 0.0;
-	k = 1;
 	lk = lambda; // lambda^1
 	for ( k = 2; k < 1000; k++ ) {
 		lk *= lambda;