[gdb] Fix UartBuffer pointer address

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Substitute GitHub CI path with local path by default.
 - Show stack overflow warning if stack usage >90%.
 - Do not attempt to load SVD file if target is unknown.
+- Fix UartBuffer pointer address computation.
 
 ## 1.5.2
 

src/emdbg/debug/px4/buffer.py

@@ -24,13 +24,14 @@ def children(self) -> Iterator[tuple[str, Any]]:
         yield ("buffer", self._buf['buffer'])
         yield ("tail -> head", f"{tail} -> {head}: {used} used, {free} free")
         if used:
+            ptr = int(self._buf['buffer'].address)
             if (tail < head):
                 # [tail, head]
-                memories = [self.read_memory(self._buf['buffer'] + tail, used)]
+                memories = [self.read_memory(ptr + tail, used)]
             else:
                 # head], [tail
-                memories = [self.read_memory(self._buf['buffer'] + tail, size - tail),
-                            self.read_memory(self._buf['buffer'], head)]
+                memories = [self.read_memory(ptr + tail, size - tail),
+                            self.read_memory(ptr, head)]
             # Convert to Prints else \hh hex values
             content = "".join(chr(v) if chr(v).isprintable() else f"\\{v:02x}"
                               for memory in memories