gdb: Fix some PEP 8 violations

Silence some warnings in my editor.  No functional change intended.

MFC after:	1 week

4 files changed, 10 insertions, 1 deletions

diff --git a/sys/tools/gdb/acttrace.py b/sys/tools/gdb/acttrace.py
index fdd18a4833cd..da79fda59da1 100644
--- a/sys/tools/gdb/acttrace.py
+++ b/sys/tools/gdb/acttrace.py
@@ -11,11 +11,13 @@ import gdb
 from freebsd import *
 from pcpu import *
 
+
 class acttrace(gdb.Command):
     """
     Print the stack trace of all threads that were on-CPU at the time of
     the panic.
     """
+
     def __init__(self):
         super(acttrace, self).__init__("acttrace", gdb.COMMAND_USER)
 
diff --git a/sys/tools/gdb/freebsd.py b/sys/tools/gdb/freebsd.py
index 81ea60373348..f88eef876c7f 100644
--- a/sys/tools/gdb/freebsd.py
+++ b/sys/tools/gdb/freebsd.py
@@ -6,6 +6,7 @@
 
 import gdb
 
+
 def symval(name):
     sym = gdb.lookup_global_symbol(name)
     if sym is None:
@@ -72,4 +73,6 @@ def tdfind(tid, pid=-1):
             tdfind.cached_threads[int(ntid)] = td
             if ntid == tid:
                 return td
+
+
 tdfind.cached_threads = dict()
diff --git a/sys/tools/gdb/pcpu.py b/sys/tools/gdb/pcpu.py
index 94c451e6eca5..08ae81e5121e 100644
--- a/sys/tools/gdb/pcpu.py
+++ b/sys/tools/gdb/pcpu.py
@@ -7,6 +7,7 @@
 import gdb
 from freebsd import *
 
+
 class pcpu(gdb.Function):
     """
     A function to look up PCPU and DPCPU fields by name.
@@ -16,6 +17,7 @@ class pcpu(gdb.Function):
     omitted, and the currently selected thread is on-CPU, that CPU is
     used, otherwise an error is raised.
     """
+
     def __init__(self):
         super(pcpu, self).__init__("PCPU")
 
@@ -73,5 +75,6 @@ class pcpu(gdb.Function):
                 obj = gdb.Value(pcpu_base + pcpu_entry_addr - start + base)
                 return obj.cast(pcpu_entry.type.pointer()).dereference()
 
+
 # Register with gdb.
 pcpu()
diff --git a/sys/tools/gdb/vnet.py b/sys/tools/gdb/vnet.py
index 5f416b2a515a..6175a5d6f551 100644
--- a/sys/tools/gdb/vnet.py
+++ b/sys/tools/gdb/vnet.py
@@ -5,9 +5,9 @@
 #
 
 import gdb
-import traceback
 from freebsd import *
 
+
 class vnet(gdb.Function):
     """
     A function to look up VNET variables by name.
@@ -18,6 +18,7 @@ class vnet(gdb.Function):
     pointer to a struct vnet (e.g., vnet0 or allprison.tqh_first->pr_vnet) or a
     string naming a jail.
     """
+
     def __init__(self):
         super(vnet, self).__init__("V")