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

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/common/cmd_scsi.c b/common/cmd_scsi.c
index e648f7d..f357465 100644
--- a/common/cmd_scsi.c
+++ b/common/cmd_scsi.c
@@ -171,7 +171,7 @@
 	if(scsi_max_devs>0)
 		scsi_curr_dev=0;
 	else
-		scsi_curr_dev=-1;
+		scsi_curr_dev = -1;
 }