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

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/board/mpl/common/usb_uhci.c b/board/mpl/common/usb_uhci.c
index 6778e40..666b999 100644
--- a/board/mpl/common/usb_uhci.c
+++ b/board/mpl/common/usb_uhci.c
@@ -536,7 +536,7 @@
 	uhci_td_t *td,*prevtd;
 
 	for(i=0;i<8;i++) {
-		prevtd=&td_int[i]; /* the first previous td is the skeleton td */
+		prevtd = &td_int[i]; /* the first previous td is the skeleton td */
 		link=swap_32(td_int[i].link) & 0xfffffff0; /* next in chain */
 		td=(uhci_td_t *)link; /* assign it */
 		/* all interrupt TDs are finally linked to the td_int[0].
@@ -638,7 +638,7 @@
 		return 1;
 	irq_free_handler(irqvec);
 	reset_hc();
-	irqvec=-1;
+	irqvec = -1;
 	return 0;
 }