Fix software upload error message

The return message in case of the iso or sig file doesn't exist was
also returning "cannot unpack non-iterable int object". This commit
fix this behavior.

Test Plan:
PASS: Software upload with non-existent files.
PASS: Software upload successfully.

Story: 2010676
Task: 51023

Change-Id: I8d487eee10d1471344ea3644d438c93bd880aa6c
Signed-off-by: Luis Eduardo Bonatti <luizeduardo.bonatti@windriver.com>

software-client/software_client/v1/release.py

@@ -63,7 +63,6 @@ class ReleaseManager(base.Manager):
         return self._fetch(path)
 
     def upload(self, args):
-        rc = 0
 
         # arg.release is a list
         releases = args.release
@@ -92,7 +91,7 @@ class ReleaseManager(base.Manager):
 
         if len(valid_files) == 0:
             print("No file to be uploaded.")
-            return rc
+            return 1
 
         path = '/v1/release'
         if is_local:

software-client/software_client/v1/release_shell.py

@@ -191,7 +191,11 @@ def _print_upload_result(resp, data, debug):
            action='store_true')
 def do_upload(cc, args):
     """Upload a software release"""
-    resp, data = cc.release.upload(args)
+    result = cc.release.upload(args)
+    if isinstance(result, int):
+        return result
+    else:
+        resp, data = result[0], result[1]
     _print_upload_result(resp, data, args.debug)
 
     return utils.check_rc(resp, data)