[ARM] Fix warning in asm/futex.h

The recently added futex.h contains an unused variable, which gcc
naturally warns about.  Remove this unused variable.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

include/asm-arm/futex.h

@@ -14,7 +14,7 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
 	int cmp = (encoded_op >> 24) & 15;
 	int oparg = (encoded_op << 8) >> 20;
 	int cmparg = (encoded_op << 20) >> 20;
-	int oldval = 0, ret, tem;
+	int oldval = 0, ret;
 	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
 		oparg = 1 << oparg;