Issue #16477: Close tarfile internal handlers in case of exception.

Patch by Serhiy Storchaka.

Lib/tarfile.py

@@ -2077,9 +2077,8 @@ class TarFile(object):
 
         # Append the tar header and data to the archive.
         if tarinfo.isreg():
-            f = bltn_open(name, "rb")
+            with bltn_open(name, "rb") as f:
                 self.addfile(tarinfo, f)
-            f.close()
 
         elif tarinfo.isdir():
             self.addfile(tarinfo)
@@ -2292,7 +2291,7 @@ class TarFile(object):
         """
         source = self.fileobj
         source.seek(tarinfo.offset_data)
-        target = bltn_open(targetpath, "wb")
+        with bltn_open(targetpath, "wb") as target:
             if tarinfo.sparse is not None:
                 for offset, size in tarinfo.sparse:
                     target.seek(offset)
@@ -2301,7 +2300,6 @@ class TarFile(object):
                 copyfileobj(source, target, tarinfo.size)
             target.seek(tarinfo.size)
             target.truncate()
-        target.close()
 
     def makeunknown(self, tarinfo, targetpath):
         """Make a file from a TarInfo object with an unknown type