uml: remove duplicate config symbol and unused file and variables

Fix the repetition of the NET symbol.  It was once in UML specific options and
once in networking.  I removed the first occurrence, as it makes more sense to
me to keep it only in networking.

It also removes a mostly empty file which is not used anymore and some
unused variables.

Signed-off-by: Karol Swietlicki <magotari@gmail.com>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 7a29123..e6d89ad 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -30,7 +30,7 @@
  */
 struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
 
-static inline int external_pid(struct task_struct *task)
+static inline int external_pid(void)
 {
 	/* FIXME: Need to look up userspace_pid by cpu */
 	return userspace_pid[0];
@@ -78,7 +78,7 @@
 static inline void set_current(struct task_struct *task)
 {
 	cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
-		{ external_pid(task), task });
+		{ external_pid(), task });
 }
 
 extern void arch_switch_to(struct task_struct *to);