fix: added powm1 instead of pow() - 1

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---

Author: nirmaljb

lib/node_modules/@stdlib/math/base/special/kernel-betainc/src/main.c

@@ -48,6 +48,7 @@
 #include "stdlib/math/base/special/min.h"
 #include "stdlib/math/base/special/minabs.h"
 #include "stdlib/math/base/special/pow.h"
+#include "stdlib/math/base/special/powm1.h"
 #include "stdlib/math/base/special/sqrt.h"
 #include <stdbool.h>
 #include <stdint.h>
@@ -826,7 +827,7 @@ void stdlib_base_kernel_betainc( double x, double a, double b, const bool regula
 		if ( y < 0.5 ) {
 			p = ( upper ) ? -stdlib_base_expm1( a * stdlib_base_log1p( -y ) ) : stdlib_base_exp( a * stdlib_base_log1p( -y ) );
 		} else {
-			p = ( upper ) ? -( stdlib_base_pow( x, a ) - 1.0 ) : stdlib_base_pow( x, a );
+			p = ( upper ) ? -stdlib_base_powm1( x, a ) : stdlib_base_pow( x, a );
 		}
 		if ( !regularized ) {
 			p /= a;