Use None instead of magic number
@@ -607,7 +607,7 @@ class LineCoverageInstrumentation(InstrumentationAdapter):
# iterate over instructions after the fist one in BB,
# put new instructions in the block for each line
file_name = cfg.bytecode_cfg().filename
- lineno = -1
+ lineno = None
instr_index = 0
while instr_index < len(basic_block):
if basic_block[instr_index].lineno != lineno:
