[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

g2o/core/robust_kernel_factory.h

@@ -138,13 +138,13 @@ class RegisterRobustKernelProxy {
 // linkage
 #define G2O_REGISTER_ROBUST_KERNEL(name, classname) \
   extern "C" void G2O_ROBUST_KERNEL_FACTORY_EXPORT  \
-      g2o_robust_kernel_##classname(void) {}        \
+  g2o_robust_kernel_##classname(void) {}            \
   static g2o::RegisterRobustKernelProxy<classname>  \
       g_robust_kernel_proxy_##classname(#name);
 
 #define G2O_USE_ROBUST_KERNEL(classname)                            \
   extern "C" void G2O_ROBUST_KERNEL_FACTORY_IMPORT                  \
-      g2o_robust_kernel_##classname(void);                          \
+  g2o_robust_kernel_##classname(void);                              \
   static g2o::ForceLinker g2o_force_robust_kernel_link_##classname( \
       g2o_robust_kernel_##classname);