arch, board: squash lines for immediate return

Remove unneeded variables and assignments.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>
Reviewed-by: Angelo Dureghello <angelo@sysam.it>
diff --git a/arch/powerpc/cpu/mpc83xx/cpu.c b/arch/powerpc/cpu/mpc83xx/cpu.c
index 3809309..c87f0fd 100644
--- a/arch/powerpc/cpu/mpc83xx/cpu.c
+++ b/arch/powerpc/cpu/mpc83xx/cpu.c
@@ -173,11 +173,7 @@
 
 unsigned long get_tbclk(void)
 {
-	ulong tbclk;
-
-	tbclk = (gd->bus_clk + 3L) / 4L;
-
-	return tbclk;
+	return (gd->bus_clk + 3L) / 4L;
 }