SDL: use != '\0' comparison instead of SDL_strlen in the functions of SDL_getenv

SDL Commits
1 
From b59ca92e823e9b050518077e202e009cbbee828f Mon Sep 17 00:00:00 2001
From: pionere <[EMAIL REDACTED]>
Date: Sat, 5 Feb 2022 10:55:09 +0100
Subject: [PATCH] use != '\0' comparison instead of SDL_strlen in the functions
 of SDL_getenv

---
 src/stdlib/SDL_getenv.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/stdlib/SDL_getenv.c b/src/stdlib/SDL_getenv.c
index d54cfe9ee65..add833284ee 100644
--- a/src/stdlib/SDL_getenv.c
+++ b/src/stdlib/SDL_getenv.c
@@ -48,7 +48,7 @@ int
 SDL_setenv(const char *name, const char *value, int overwrite)
 {
     /* Input validation */
-    if (!name || SDL_strlen(name) == 0 || SDL_strchr(name, '=') != NULL || !value) {
+    if (!name || *name == '\0' || SDL_strchr(name, '=') != NULL || !value) {
         return (-1);
     }
     
@@ -59,7 +59,7 @@ int
 SDL_setenv(const char *name, const char *value, int overwrite)
 {
     /* Input validation */
-    if (!name || SDL_strlen(name) == 0 || SDL_strchr(name, '=') != NULL || !value) {
+    if (!name || *name == '\0' || SDL_strchr(name, '=') != NULL || !value) {
         return (-1);
     }
     
@@ -82,7 +82,7 @@ SDL_setenv(const char *name, const char *value, int overwrite)
     char *new_variable;
 
     /* Input validation */
-    if (!name || SDL_strlen(name) == 0 || SDL_strchr(name, '=') != NULL || !value) {
+    if (!name || *name == '\0' || SDL_strchr(name, '=') != NULL || !value) {
         return (-1);
     }
     
@@ -115,7 +115,7 @@ SDL_setenv(const char *name, const char *value, int overwrite)
     char *new_variable;
 
     /* Input validation */
-    if (!name || SDL_strlen(name) == 0 || SDL_strchr(name, '=') != NULL || !value) {
+    if (!name || *name == '\0' || SDL_strchr(name, '=') != NULL || !value) {
         return (-1);
     }
 
@@ -181,7 +181,7 @@ SDL_getenv(const char *name)
 #endif
 
     /* Input validation */
-    if (!name || !*name) {
+    if (!name || *name == '\0') {
         return NULL;
     }
 
@@ -194,7 +194,7 @@ SDL_getenv(const char *name)
     size_t bufferlen;
 
     /* Input validation */
-    if (!name || SDL_strlen(name)==0) {
+    if (!name || *name == '\0') {
         return NULL;
     }
     
@@ -222,7 +222,7 @@ SDL_getenv(const char *name)
     char *value;
 
     /* Input validation */
-    if (!name || SDL_strlen(name)==0) {
+    if (!name || *name == '\0') {
         return NULL;
     }