Merge "zstd negative compression support" into main am: e836a3a2e4 am: 8552a323a6

Original change: https://android-review.googlesource.com/c/platform/build/+/2708515

Change-Id: I7dece70df4471d60cdec7d80131f8c8f7b92cf58
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 67438e6..2c5fe0d 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -1288,7 +1288,7 @@
       assert len(words) >= 1 and len(words) <= 2
       OPTIONS.vabc_compression_param = a.lower()
       if len(words) == 2:
-        if not words[1].isdigit():
+        if not words[1].lstrip("-").isdigit():
           raise ValueError("Cannot parse value %r for option $COMPRESSION_LEVEL - only "
                            "integers are allowed." % words[1])
     elif o == "--security_patch_level":