fix inconsistent use of tabs and spaces in indentation

Author: RootLUG

exiftool.py

@@ -224,10 +224,10 @@ def execute(self, *params):
         output = b""
         fd = self._process.stdout.fileno()
         while not output[-32:].strip().endswith(sentinel):
-        	inputready,outputready,exceptready = select.select([fd],[],[])
-                for i in inputready:
-                        if i == fd:
-                                output += os.read(fd, block_size)
+            inputready,outputready,exceptready = select.select([fd],[],[])
+            for i in inputready:
+                if i == fd:
+                    output += os.read(fd, block_size)
         return output.strip()[:-len(sentinel)]
 
     def execute_json(self, *params):