Code cleanup: fix old style assignment ambiguities like "=-" etc.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/drivers/input/pc_keyb.c b/drivers/input/pc_keyb.c
index 81d3e98..33e7c5f 100644
--- a/drivers/input/pc_keyb.c
+++ b/drivers/input/pc_keyb.c
@@ -64,7 +64,7 @@
 	int val;
 	unsigned char status;
 
-	val=-1;
+	val = -1;
 	status = kbd_read_status();
 	if (status & KBD_STAT_OBF) {
 		val = kbd_read_input();