added lzma import statement again

src/binwalk/plugins/lzmaextract.py

@@ -12,6 +12,7 @@ class LZMAExtractPlugin(binwalk.core.plugin.Plugin):
             # lzma package in Python 2.0 decompress() does not handle multiple
             # compressed streams, only first stream is extracted.
             # backports.lzma package could be used to keep consistent behaviour.
+            import lzma
             self.decompressor = lzma.decompress
 
             # If the extractor is enabled for the module we're currently loaded