examples: fix static code analysis findings

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>

examples/c/i2c_hmc5883l.c

@@ -123,7 +123,7 @@ main(void)
     }
 
     /* set slave address */
-    mraa_i2c_address(i2c, HMC5883L_I2C_ADDR);
+    status = mraa_i2c_address(i2c, HMC5883L_I2C_ADDR);
     if (status != MRAA_SUCCESS) {
         goto err_exit;
     }

examples/python/mcp3004.py

@@ -35,6 +35,6 @@ txbuf[2] = 0x00
 while True:
     rxbuf = dev.write(txbuf)
     value = ((rxbuf[1] & 0x03) << 8) | rxbuf[2]
-    print value
+    print(value)
     time.sleep(0.5)
 

examples/python/spi.py

@@ -38,6 +38,5 @@ for x in range(0,100):
   rxbuf = dev.write(txbuf)
   if rxbuf != txbuf:
     print("We have an error captain!")
-    break
     exit(1)