iscsi-target: Fix typos in RDMAEXTENSIONS macro usage

This patch fixes a handful of typos in 'RDMAEXTENTIONS' -> 'RDMAEXTENSIONS'
macro usage.

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/iscsi/iscsi_target_parameters.c b/drivers/target/iscsi/iscsi_target_parameters.c
index f690be9..c2185fc 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.c
+++ b/drivers/target/iscsi/iscsi_target_parameters.c
@@ -436,7 +436,7 @@
 	/*
 	 * Extra parameters for ISER from RFC-5046
 	 */
-	param = iscsi_set_default_param(pl, RDMAEXTENTIONS, INITIAL_RDMAEXTENTIONS,
+	param = iscsi_set_default_param(pl, RDMAEXTENSIONS, INITIAL_RDMAEXTENSIONS,
 			PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
 			TYPERANGE_BOOL_AND, USE_LEADING_ONLY);
 	if (!param)
@@ -529,7 +529,7 @@
 			SET_PSTATE_NEGOTIATE(param);
 		} else if (!strcmp(param->name, OFMARKINT)) {
 			SET_PSTATE_NEGOTIATE(param);
-		} else if (!strcmp(param->name, RDMAEXTENTIONS)) {
+		} else if (!strcmp(param->name, RDMAEXTENSIONS)) {
 			if (iser == true)
 				SET_PSTATE_NEGOTIATE(param);
 		} else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH)) {
@@ -580,7 +580,7 @@
 			param->state &= ~PSTATE_NEGOTIATE;
 		else if (!strcmp(param->name, OFMARKINT))
 			param->state &= ~PSTATE_NEGOTIATE;
-		else if (!strcmp(param->name, RDMAEXTENTIONS))
+		else if (!strcmp(param->name, RDMAEXTENSIONS))
 			param->state &= ~PSTATE_NEGOTIATE;
 		else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH))
 			param->state &= ~PSTATE_NEGOTIATE;
@@ -1977,7 +1977,7 @@
 			ops->SessionType = !strcmp(param->value, DISCOVERY);
 			pr_debug("SessionType:                  %s\n",
 				param->value);
-		} else if (!strcmp(param->name, RDMAEXTENTIONS)) {
+		} else if (!strcmp(param->name, RDMAEXTENSIONS)) {
 			ops->RDMAExtensions = !strcmp(param->value, YES);
 			pr_debug("RDMAExtensions:               %s\n",
 				param->value);