fix: improve parameter validation and style in binomial/logpmf

- Fix integer comparisons in edge cases (x == 0 instead of x == 0.0)
- Improve parameter validation logic for cleaner code flow
- Fix JSDoc example to use integer (3 instead of 3.0)
- Maintain correct int32_t types for discrete parameters x and n

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Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/binomial/logpmf/include/stdlib/stats/base/dists/binomial/logpmf.h

@@ -21,6 +21,7 @@
 
 #include <stdint.h>
 
+
 /*
 * If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C compiler.
 */

lib/node_modules/@stdlib/stats/base/dists/binomial/logpmf/src/main.c

@@ -35,7 +35,7 @@
 * @return   evaluated logPMF
 *
 * @example
-* double y = stdlib_base_dists_binomial_logpmf( 3.0, 20, 0.2 );
+* double y = stdlib_base_dists_binomial_logpmf( 3, 20, 0.2 );
 * // returns ~-1.583
 */
 double stdlib_base_dists_binomial_logpmf( const int32_t x, const int32_t n, const double p ) {
@@ -47,19 +47,16 @@ double stdlib_base_dists_binomial_logpmf( const int32_t x, const int32_t n, cons
 	) {
 		return 0.0 / 0.0;
 	}
-	if ( x >= 0 ){
-		if ( x > n ) {
-			return STDLIB_CONSTANT_FLOAT64_NINF;
-		}
-		if ( p == 0.0 ) {
-			return ( x == 0.0 ) ? 0.0 : STDLIB_CONSTANT_FLOAT64_NINF;
-		}
-		if ( p == 1.0 ) {
-			return ( x == n ) ? 0.0 : STDLIB_CONSTANT_FLOAT64_NINF;
-		}
-		double out = stdlib_base_binomcoefln( n, x );
-		out += ( x * stdlib_base_ln( p ) ) + ( ( n - x ) * stdlib_base_log1p( -p ) );
-		return out;
+	if ( x < 0 || x > n ) {
+		return STDLIB_CONSTANT_FLOAT64_NINF;
 	}
-	return STDLIB_CONSTANT_FLOAT64_NINF;
+	if ( p == 0.0 ) {
+		return ( x == 0 ) ? 0.0 : STDLIB_CONSTANT_FLOAT64_NINF;
+	}
+	if ( p == 1.0 ) {
+		return ( x == n ) ? 0.0 : STDLIB_CONSTANT_FLOAT64_NINF;
+	}
+	double out = stdlib_base_binomcoefln( n, x );
+	out += ( x * stdlib_base_ln( p ) ) + ( ( n - x ) * stdlib_base_log1p( -p ) );
+	return out;
 }