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kernel: remove unused variables from arm trap() handler

--- a/sys/src/9/bcm/trap.c

+++ b/sys/src/9/bcm/trap.c

@@ -131,7 +131,7 @@

 void

 trap(Ureg *ureg)

 {

-	int user, x, rv, rem;

+	int user, x, rv;

 	ulong inst, fsr;

 	uintptr va;

 	char buf[ERRMAX];

--- a/sys/src/9/kw/trap.c

+++ b/sys/src/9/kw/trap.c

@@ -365,7 +365,7 @@

 void

 trap(Ureg *ureg)

 {

-	int user, x, rv, rem;

+	int user, x, rv;

 	ulong inst;

 	u32int fsr;

 	uintptr va;

--- a/sys/src/9/omap/trap.c

+++ b/sys/src/9/omap/trap.c

@@ -446,7 +446,7 @@

 void

 trap(Ureg *ureg)

 {

-	int user, x, rv, rem;

+	int user, x, rv;

 	ulong inst, fsr;

 	uintptr va;

 	char buf[ERRMAX];