Kernel: Fix -Wunreachable-code warnings from clang

Author: https://github.com/nico
Commit: 1cdb12e920
Pull-request: https://github.com/SerenityOS/serenity/pull/10399

Kernel/Process.cpp

@@ -592,8 +592,8 @@ bool Process::dump_perfcore()
     }
     auto json_buffer = UserOrKernelBuffer::for_kernel_buffer(json->data());
     if (description.write(json_buffer, json->size()).is_error()) {
-        return false;
         dbgln("Failed to generate perfcore for pid {}: Could not write to perfcore file.", pid().value());
+        return false;
     }
 
     dbgln("Wrote perfcore for pid {} to {}", pid().value(), description.absolute_path());