Github action fix only: fail on AStyle failure. (#1024)

The Github action wasn't failing if AStyle returned an error.  It does now.

.github/workflows/style.yml

@@ -18,5 +18,4 @@ jobs:
           sudo apt install doxygen astyle python3
       - name: check
         run: |
-          python3 astyle.py
-          UBX_WORKDIR="$(pwd)" doxygen
+          python3 astyle.py && UBX_WORKDIR="$(pwd)" doxygen

astyle.py

@@ -13,11 +13,11 @@
                       stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                       universal_newlines=True) as astyle:
     fail = False
-    output = astyle.communicate()
-    for line in output:
+    output, _ = astyle.communicate()
+    for line in output.splitlines():
         if line.startswith("Formatted"):
             fail = True
-        print (line, end="")
+        print (line)
     if astyle.returncode != 0:
         fail = True
     sys.exit(1 if fail else 0)