Move checkFirmwareImage() from shared.js to uhk.js

packages/usb/shared.js

@@ -1,22 +1,5 @@
 require('shelljs/global');
 
-function checkFirmwareImage(imagePath, extension) {
-    if (!imagePath) {
-        echo('No firmware image specified.');
-        exit(1);
-    }
-
-    if (!imagePath.endsWith(extension)) {
-        echo(`Firmware image extension is not ${extension}`);
-        exit(1);
-    }
-
-    if (!test('-f', imagePath)) {
-        echo('Firmware image does not exist.');
-        exit(1);
-    }
-}
-
 function getBlhostCmd(pid) {
     let blhostPath;
     switch (process.platform) {
@@ -55,7 +38,6 @@ function execRetry(command) {
 }
 
 const exp = {
-    checkFirmwareImage,
     getBlhostCmd,
     execRetry,
 }