Added check for backports.lzma when importing lzma module

src/binwalk/modules/compression.py

@@ -2,11 +2,14 @@
 
 import os
 import zlib
-import lzma
 import struct
 import binwalk.core.compat
 import binwalk.core.common
 from binwalk.core.module import Option, Kwarg, Module
+try:
+    import lzma
+except ImportError:
+    from backports import lzma
 
 class LZMAHeader(object):
     def __init__(self, **kwargs):

src/binwalk/plugins/lzmaextract.py

@@ -12,7 +12,11 @@ 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.
+            try:
                 import lzma
+            except ImportError:
+                from backports import lzma
+
             self.decompressor = lzma.decompress
 
             # If the extractor is enabled for the module we're currently loaded

src/binwalk/plugins/lzmavalid.py

@@ -17,7 +17,10 @@ class LZMAPlugin(binwalk.core.plugin.Plugin):
 
     def init(self):
         try:
+            try:
                 import lzma
+            except ImportError:
+                from backports import lzma
             self.decompressor = lzma.decompress
         except ImportError as e:
             self.decompressor = None