suggestions.c: Improve efficiency of levenshtein_distance method (#91835)

Python/suggestions.c

@@ -78,9 +78,11 @@ levenshtein_distance(const char *a, size_t a_size,
     // Instead of producing the whole traditional len(a)-by-len(b)
     // matrix, we can update just one row in place.
     // Initialize the buffer row
+    size_t tmp = MOVE_COST;
     for (size_t i = 0; i < a_size; i++) {
         // cost from b[:0] to a[:i+1]
-        buffer[i] = (i + 1) * MOVE_COST;
+        buffer[i] = tmp;
+        tmp += MOVE_COST;
     }
 
     size_t result = 0;