examples: misc static code analysis fixes

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

examples/c++/AioA0.cpp

@@ -33,9 +33,6 @@ main()
     mraa::Aio* a0;
 
     a0 = new mraa::Aio(0);
-    if (a0 == NULL) {
-        return MRAA_ERROR_UNSPECIFIED;
-    }
 
     for (;;) {
         adc_value = a0->read();

examples/c++/Blink-IO.cpp

@@ -56,12 +56,10 @@ main(int argc, char** argv)
 
     //! [Interesting]
     mraa::Gpio* gpio = new mraa::Gpio(iopin);
-    if (gpio == NULL) {
-        return mraa::ERROR_UNSPECIFIED;
-    }
     mraa::Result response = gpio->dir(mraa::DIR_OUT);
     if (response != mraa::SUCCESS) {
         mraa::printError(response);
+        delete gpio;
         return 1;
     }
 

examples/c++/Isr-pin6.cpp

@@ -53,5 +53,6 @@ main()
         sleep(1);
     }
 
+    delete x;
     return EXIT_SUCCESS;
 }

examples/c++/Pwm3-cycle.cpp

@@ -46,9 +46,6 @@ main()
     mraa::Pwm* pwm;
 
     pwm = new mraa::Pwm(3);
-    if (pwm == NULL) {
-        return MRAA_ERROR_UNSPECIFIED;
-    }
     fprintf(stdout, "Cycling PWM on IO3 (pwm3) \n");
     pwm->enable(true);
 

examples/c++/UartOW.cpp

@@ -27,8 +27,6 @@
 //! [Interesting]
 #include "uart_ow.hpp"
 
-using namespace std;
-
 int
 main(int argc, char** argv)
 {
@@ -38,21 +36,23 @@ main(int argc, char** argv)
     mraa::Result rv;
 
     if ((rv = uart->reset()) == mraa::SUCCESS) {
-        cout << "Reset succeeded, device(s) detected!" << endl;
+        std::cout << "Reset succeeded, device(s) detected!" << std::endl;
     } else {
-        cout << "Reset failed, returned " << int(rv) << ". No devices on bus?" << endl;
+        std::cout << "Reset failed, returned " << int(rv) << ". No devices on bus?" << std::endl;
+        delete uart;
         return 1;
     }
 
-    cout << "Looking for devices..." << endl;
+    std::cout << "Looking for devices..." << std::endl;
     ;
 
     uint8_t count = 0;
     // start the search from scratch
-    string id = uart->search(true);
+    std::string id = uart->search(true);
 
     if (id.empty()) {
-        cout << "No devices detected." << endl;
+        std::cout << "No devices detected." << std::endl;
+        delete uart;
         return 1;
     }
 
@@ -73,7 +73,7 @@ main(int argc, char** argv)
         id = uart->search(false);
     }
 
-    cout << "Exiting..." << endl;
+    std::cout << "Exiting..." << std::endl;
 
     delete uart;