Update main.c

Signed-off-by: Lokesh Ranjan <lokesh.ranjan.phe23@itbhu.ac.in>

Author: Lokeshranjan8

lib/node_modules/@stdlib/stats/base/dists/erlang/cdf/src/main.c

@@ -36,7 +36,8 @@
 */
 double stdlib_base_dists_erlang_cdf( const double x, const int32_t k, const double lambda ) {
 	if (
-		!stdlib_base_is_nonnegative_integer( k )
+		!stdlib_base_is_nonnegative_integer( k ) ||
+		k <= 0
 	) {
 		return 0.0 / 0.0;
 	}