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

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/common/devices.c b/common/devices.c
index ddf8f8e..9cc963a 100644
--- a/common/devices.c
+++ b/common/devices.c
@@ -125,7 +125,7 @@
 	device_t *dev = NULL;
 	char temp_names[3][8];
 
-	dev_index=-1;
+	dev_index = -1;
 	for (i=1; i<=ListNumItems(devlist); i++) {
 		dev = ListGetPtrToItem (devlist, i);
 		if(strcmp(dev->name,devname)==0) {