Added file.close to examples (espressif#3611)

Author: lbernstone

libraries/FFat/examples/FFat_Test/FFat_Test.ino

@@ -52,6 +52,7 @@ void readFile(fs::FS &fs, const char * path){
  while(file.available()){
  Serial.write(file.read());
  }
+ file.close();
 }
 
 void writeFile(fs::FS &fs, const char * path, const char * message){
@@ -67,6 +68,7 @@ void writeFile(fs::FS &fs, const char * path, const char * message){
  } else {
  Serial.println("- write failed");
  }
+ file.close();
 }
 
 void appendFile(fs::FS &fs, const char * path, const char * message){
@@ -82,6 +84,7 @@ void appendFile(fs::FS &fs, const char * path, const char * message){
  } else {
  Serial.println("- append failed");
  }
+ file.close();
 }
 
 void renameFile(fs::FS &fs, const char * path1, const char * path2){

libraries/SPIFFS/examples/SPIFFS_Test/SPIFFS_Test.ino

@@ -50,6 +50,7 @@ void readFile(fs::FS &fs, const char * path){
  while(file.available()){
  Serial.write(file.read());
  }
+ file.close();
 }
 
 void writeFile(fs::FS &fs, const char * path, const char * message){
@@ -65,6 +66,7 @@ void writeFile(fs::FS &fs, const char * path, const char * message){
  } else {
  Serial.println("- write failed");
  }
+ file.close();
 }
 
 void appendFile(fs::FS &fs, const char * path, const char * message){
@@ -80,6 +82,7 @@ void appendFile(fs::FS &fs, const char * path, const char * message){
  } else {
  Serial.println("- append failed");
  }
+ file.close();
 }
 
 void renameFile(fs::FS &fs, const char * path1, const char * path2){