microblaze: Remove unused variable from ptrace

Patch b3c1e01a09d6af2dd7811a066ffcfc5171be2bed should do it.

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/kernel/ptrace.c b/arch/microblaze/kernel/ptrace.c
index 6d6349a..a4a7770 100644
--- a/arch/microblaze/kernel/ptrace.c
+++ b/arch/microblaze/kernel/ptrace.c
@@ -75,7 +75,6 @@
 {
 	int rval;
 	unsigned long val = 0;
-	unsigned long copied;
 
 	switch (request) {
 	/* Read/write the word at location ADDR in the registers. */