Remove trailing whitespaces and fix indentation

pkgs/development/compilers/gcc/common/configure-flags.nix

@@ -73,7 +73,7 @@ let
       "--enable-libssp"
       "--disable-nls"
       # To keep ABI compatibility with upstream mingw-w64
-      "--enable-fully-dynamic-string"      
+      "--enable-fully-dynamic-string"
     ] ++ lib.optionals (crossMingw && targetPlatform.isx86_32) [
       # See Note [Windows Exception Handling]
       "--enable-sjlj-exceptions"
@@ -187,10 +187,10 @@ let
       "--disable-symvers"
       "libat_cv_have_ifunc=no"
       "--disable-gnu-indirect-function"
-    ] 
+    ]
     ++ lib.optionals langJit [
       "--enable-host-shared"
-    ] 
+    ]
     ++ lib.optionals (langD) [
       "--with-target-system-zlib=yes"
     ]

pkgs/development/python-modules/jinja2/default.nix

@@ -4,7 +4,7 @@
 , fetchPypi
 , pytest
 , markupsafe
-, setuptools 
+, setuptools
 }:
 
 buildPythonPackage rec {

pkgs/tools/networking/dhcp/default.nix

@@ -68,7 +68,7 @@ stdenv.mkDerivation rec {
     ''
       substituteInPlace configure --replace "/usr/bin/file" "${file}/bin/file"
       sed -i "includes/dhcpd.h" \
-	-"es|^ *#define \+_PATH_DHCLIENT_SCRIPT.*$|#define _PATH_DHCLIENT_SCRIPT \"$out/sbin/dhclient-script\"|g"
+          -e "s|^ *#define \+_PATH_DHCLIENT_SCRIPT.*$|#define _PATH_DHCLIENT_SCRIPT \"$out/sbin/dhclient-script\"|g"
 
       export AR='${stdenv.cc.bintools.bintools}/bin/${stdenv.cc.targetPrefix}ar'
     '';