GC unused variables.

src/libmach/machpower.c

diff --git a/src/libmach/machpower.c b/src/libmach/machpower.c
index 6191721..701e9c6 100644
--- a/src/libmach/machpower.c
+++ b/src/libmach/machpower.c
@@ -1348,8 +1348,6 @@
 	 * to disassemble the function prologues in order to figure
 	 * this out.
 	 */
-	ulong b[2];
-
 	// evaluate lr
 	// if in this function, no good - go to saved one.
 	// set next[sp] to *cur[sp]