fix: remove unnecessary parameter checks for int32_t in factorial2

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: na
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: passed
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: Planeshifter

lib/node_modules/@stdlib/math/base/special/factorial2/manifest.json

@@ -37,8 +37,6 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/unary",
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/assert/is-integer",
         "@stdlib/math/base/assert/is-even",
         "@stdlib/constants/float64/pinf",
         "@stdlib/constants/float64/max-nth-double-factorial"
@@ -55,8 +53,6 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/assert/is-integer",
         "@stdlib/math/base/assert/is-even",
         "@stdlib/constants/float64/pinf",
         "@stdlib/constants/float64/max-nth-double-factorial"
@@ -73,8 +69,6 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/assert/is-integer",
         "@stdlib/math/base/assert/is-even",
         "@stdlib/constants/float64/pinf",
         "@stdlib/constants/float64/max-nth-double-factorial"

lib/node_modules/@stdlib/math/base/special/factorial2/src/main.c

@@ -17,8 +17,6 @@
 */
 
 #include "stdlib/math/base/special/factorial2.h"
-#include "stdlib/math/base/assert/is_nan.h"
-#include "stdlib/math/base/assert/is_integer.h"
 #include "stdlib/math/base/assert/is_even.h"
 #include "stdlib/constants/float64/pinf.h"
 #include "stdlib/constants/float64/max_nth_double_factorial.h"
@@ -39,13 +37,10 @@ double stdlib_base_factorial2( const int32_t n ) {
 	double out;
 	int32_t v;
 	int32_t i;
-	if ( stdlib_base_is_nan( n ) ) {
-		return 0.0/0.0; // NaN
-	}
 	if ( n > STDLIB_CONSTANT_FLOAT64_MAX_NTH_DOUBLE_FACTORIAL ) {
 		return STDLIB_CONSTANT_FLOAT64_PINF;
 	}
-	if ( n < 0 || !stdlib_base_is_integer( n ) ) {
+	if ( n < 0 ) {
 		return 0.0/0.0;
 	}
 	v = n;