sctp: Don't abort initialization when CONFIG_PROC_FS=n

This puts CONFIG_PROC_FS defines around the proc init/exit functions
and also avoids compiling proc.c if procfs is not supported.
Also make SCTP_DBG_OBJCNT depend on procfs.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/Makefile

diff --git a/net/sctp/Makefile b/net/sctp/Makefile
index f5356b9..6b79473 100644
--- a/net/sctp/Makefile
+++ b/net/sctp/Makefile
@@ -9,10 +9,10 @@
 	  transport.o chunk.o sm_make_chunk.o ulpevent.o \
 	  inqueue.o outqueue.o ulpqueue.o command.o \
 	  tsnmap.o bind_addr.o socket.o primitive.o \
-	  output.o input.o debug.o ssnmap.o proc.o \
-	  auth.o
+	  output.o input.o debug.o ssnmap.o auth.o
 
 sctp-$(CONFIG_SCTP_DBG_OBJCNT) += objcnt.o
+sctp-$(CONFIG_PROC_FS) += proc.o
 sctp-$(CONFIG_SYSCTL) += sysctl.o
 
 sctp-$(subst m,y,$(CONFIG_IPV6))	+= ipv6.o