scripts: gen_gcov_files.py: PEP 8 style fixes

Fix PEP 8 coding style issues reported by pycodestyle.

Signed-off-by: Ruslan Mstoi <ruslan.mstoi@intel.com>
diff --git a/scripts/gen_gcov_files.py b/scripts/gen_gcov_files.py
index 10c2f2f..ada42fc 100755
--- a/scripts/gen_gcov_files.py
+++ b/scripts/gen_gcov_files.py
@@ -13,6 +13,7 @@
 import os
 import re
 
+
 def retrieve_data(input_file):
     extracted_coverage_info = {}
     capture_data = False
@@ -33,12 +34,13 @@
             file_name = line.split("<")[0][1:]
             # Remove the trailing new line char
             hex_dump = line.split("<")[1][:-1]
-            extracted_coverage_info.update({file_name:hex_dump})
+            extracted_coverage_info.update({file_name: hex_dump})
 
     if not reached_end:
-        print("incomplete data captured from %s" %input_file)
+        print("incomplete data captured from %s" % input_file)
     return extracted_coverage_info
 
+
 def create_gcda_files(extracted_coverage_info):
     if args.verbose:
         print("Generating gcda files")
@@ -71,7 +73,6 @@
     args = parser.parse_args()
 
 
-
 def main():
     parse_args()
     input_file = args.input