BaseTools: Fix a typo in ini.py

"if mis not None:" => "if m is not None:"

Contributed-under: TianoCore Contribution Agreement 1.1
Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

BaseTools/Scripts/PackageDocumentTools/plugins/EdkPlugins/basemodel/ini.py

@@ -122,7 +122,7 @@ class BaseINIFile(object):
                 continue
 
             m = section_re.match(templine)
-            if mis not None: # found a section
+            if m is not None: # found a section
                 inGlobal = False
                 # Finish the latest section first
                 if len(sObjs) != 0: