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/board/amcc/canyonlands/canyonlands.c b/board/amcc/canyonlands/canyonlands.c
index dc2e3ba..80b7739 100644
--- a/board/amcc/canyonlands/canyonlands.c
+++ b/board/amcc/canyonlands/canyonlands.c
@@ -63,11 +63,7 @@
  */
 static inline int board_fpga_read(int offset)
 {
-	int data;
-
-	data = in_8((void *)(CONFIG_SYS_FPGA_BASE + offset));
-
-	return data;
+	return in_8((void *)(CONFIG_SYS_FPGA_BASE + offset));
 }
 
 static inline void board_fpga_write(int offset, int data)