Cppcheck fixes (#47)

* possible memory leak checks
* update README.md

Author: barrust

README.md

@@ -2,11 +2,10 @@
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
 [![GitHub release](https://img.shields.io/github/release/barrust/c-utils.svg)](https://github.com/barrust/c-utils/releases)
-[![Build Status](https://travis-ci.org/barrust/c-utils.svg?branch=master)](https://travis-ci.org/barrust/c-utils)
+[![Build Status](https://github.com/barrust/c-utils/workflows/C/C++%20CI/badge.svg)](https://github.com/barrust/c-utils/actions)
 [![codecov](https://codecov.io/gh/barrust/c-utils/branch/master/graph/badge.svg)](https://codecov.io/gh/barrust/c-utils)
 
 
-
 This project provides a collection of utility libraries to help reduce the need to write similar code for each project on an ad-hoc basis. The need is based on what I have needed in most projects but are ended up written, as needed, and usually differently each time and without unit tests. The goal is to provide a single place to store each of these libraries and to provide unit tests.
 
 If there are other commonly used code or data-structures that should be added, please add a feature request!

src/fileutils.c

@@ -824,6 +824,8 @@ static char** __str_split_string_any(char* s, const char* s2, size_t* num) {
     *num = cnt;
 
     char** v = (char**)realloc(results, cnt * sizeof(char*));
+    if (v == NULL)
+        return results;
     return v;
 }
 

src/stringlib.c

@@ -479,6 +479,8 @@ char** s_split_string_c(const char* s, const char c, int* num) {
     *num = cnt;
 
     char** v = (char**)realloc(results, cnt * sizeof(char*));
+    if (v == NULL)
+        return results;
     return v;
 }
 
@@ -511,6 +513,8 @@ char** s_split_string_str(const char* s, const char* sub, int* num) {
     *num = cnt;
 
     char** v = (char**)realloc(results, cnt * sizeof(char*));
+    if (v == NULL)
+        return results;
     return v;
 }
 
@@ -545,6 +549,8 @@ char** s_split_string_any(const char* s, const char* s2, int* num) {
     *num = cnt;
 
     char** v = (char**)realloc(results, cnt * sizeof(char*));
+    if (v == NULL)
+        return results;
     return v;
 }