sctp: correct CONFIG_SCTP_DBG_OBJCNT macro name in comment

A comment in <net/sctp/sctp.h> incorrectly refers to
CONFIG_SCTP_DBG_OBJCOUNT instead of CONFIG_SCTP_DBG_OBJCNT. Correct it.

Discovered while searching for CONFIG_* symbols referenced in code but
not defined in any Kconfig file.

Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Link: https://patch.msgid.link/20260613233725.162470-1-enelsonmoore@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/sctp/sctp.h

@@ -303,7 +303,7 @@ void sctp_dbg_objcnt_init(struct net *);
 
 static inline void sctp_dbg_objcnt_init(struct net *net) { return; }
 
-#endif /* CONFIG_SCTP_DBG_OBJCOUNT */
+#endif /* CONFIG_SCTP_DBG_OBJCNT */
 
 #if defined CONFIG_SYSCTL
 void sctp_sysctl_register(void);