net: fix Makefile typos & build errors

Fix many (randconfig) PPP build errors by fixing typos in
drivers/net/Makefile.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/Makefile

@@ -35,7 +35,7 @@ obj-$(CONFIG_HIPPI) += hippi/
 obj-$(CONFIG_HAMRADIO) += hamradio/
 obj-$(CONFIG_IRDA) += irda/
 obj-$(CONFIG_PLIP) += plip/
-onj-$(CONFIG_PPP) += ppp/
+obj-$(CONFIG_PPP) += ppp/
 obj-$(CONFIG_PPP_ASYNC) += ppp/
 obj-$(CONFIG_PPP_BSDCOMP) += ppp/
 obj-$(CONFIG_PPP_DEFLATE) += ppp/
@@ -44,10 +44,10 @@ obj-$(CONFIG_PPP_SYNC_TTY) += ppp/
 obj-$(CONFIG_PPPOE) += ppp/
 obj-$(CONFIG_PPPOL2TP) += ppp/
 obj-$(CONFIG_PPTP) += ppp/
-onj-$(CONFIG_SLIP) += slip/
+obj-$(CONFIG_SLIP) += slip/
 obj-$(CONFIG_SLHC) += slip/
 obj-$(CONFIG_NET_SB1000) += sb1000.o
-onj-$(CONFIG_SLIP) += slip/
+obj-$(CONFIG_SLIP) += slip/
 obj-$(CONFIG_SUNGEM_PHY) += sungem_phy.o
 obj-$(CONFIG_TR) += tokenring/
 obj-$(CONFIG_WAN) += wan/