donate-cpu.py: Fix some PEP 8 and other warnings (#1579)

There should not be functional changes.
Tested locally.

tools/donate-cpu.py

@@ -29,6 +29,7 @@ import time
 import re
 import tarfile
 
+
 def checkRequirements():
     result = True
     for app in ['g++', 'git', 'make', 'wget']:
@@ -39,6 +40,7 @@ def checkRequirements():
             result = False
     return result
 
+
 def getCppcheck(cppcheckPath):
     print('Get Cppcheck..')
     for i in range(5):
@@ -115,7 +117,6 @@ def getPackage(server_address):
     return package.decode('utf-8')
 
 
-
 def handleRemoveReadonly(func, path, exc):
     import stat
     if not os.access(path, os.W_OK):
@@ -260,6 +261,7 @@ def splitResults(results):
         ret.append(w.strip())
     return ret
 
+
 def diffResults(workPath, ver1, results1, ver2, results2):
     print('Diff results..')
     ret = ''
@@ -312,6 +314,7 @@ def uploadResults(package, results, server_address):
             pass
     return False
 
+
 jobs = '-j1'
 stopTime = None
 workpath = os.path.expanduser('~/cppcheck-donate-cpu-workfolder')
@@ -373,10 +376,10 @@ while True:
         sys.exit(1)
     for ver in cppcheckVersions:
         if ver == 'head':
-            if compile(cppcheckPath, jobs) == False:
+            if not compile(cppcheckPath, jobs):
                 print('Failed to compile Cppcheck, retry later')
                 sys.exit(1)
-        elif compile_version(workpath, jobs, ver) == False:
+        elif not compile_version(workpath, jobs, ver):
             print('Failed to compile Cppcheck-{}, retry later'.format(ver))
             sys.exit(1)
     if packageUrl:
@@ -398,7 +401,7 @@ while True:
             cppcheck = 'cppcheck/cppcheck'
         else:
             cppcheck = ver + '/cppcheck'
-        c,errout,t = scanPackage(workpath, cppcheck, jobs)
+        c, errout, t = scanPackage(workpath, cppcheck, jobs)
         if c < 0:
             crash = True
             count += ' Crash!'