Use another augmented assignment statement

[elfring]

:eyes: Some source code analysis tools can help to find opportunities for improving software components. :thought_balloon: I propose to increase the usage of augmented assignment statements accordingly.

diff --git a/kombu/common.py b/kombu/common.py
index 08bc1aff..6b44d94c 100644
--- a/kombu/common.py
+++ b/kombu/common.py
@@ -399,7 +399,7 @@ class QoS:
         """
         with self._mutex:
             if self.value:
-                self.value = self.value + max(n, 0)
+                self.value += max(n, 0)
         return self.value
 
     def decrement_eventually(self, n=1):

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[matusvalo]

@elfring thank you issue. Definitely make sense. PR is highly welcome.

[elfring]

:thought_balloon: How will the chances evolve to adjust one assignment statement directly?