beaglebone.c: use the ret variable in i2c_init_pre also when successful

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

src/arm/beaglebone.c

@@ -275,7 +275,7 @@ mraa_beaglebone_i2c_init_pre(unsigned int bus)
             }
         }
 
-        return MRAA_SUCCESS;
+        ret = MRAA_SUCCESS;
     } else {
         syslog(LOG_ERR, "i2c: Device %s not initialized", devpath);
         ret = MRAA_ERROR_INVALID_HANDLE;
@@ -1465,4 +1465,4 @@ error:
     syslog(LOG_CRIT, "Beaglebone: failed to initialize");
     free(b);
     return NULL;
-};
+};