[Pal/Linux-SGX] Fix typo: externel -> external

Signed-off-by: Isaku Yamahata <isaku.yamahata@gmail.com>

Pal/src/host/Linux-SGX/db_exception.c

@@ -339,7 +339,7 @@ void _DkExceptionReturn (void * event)
     restore_sgx_context(&uc);
 }
 
-void _DkHandleExternelEvent (PAL_NUM event, sgx_context_t * uc)
+void _DkHandleExternalEvent (PAL_NUM event, sgx_context_t * uc)
 {
     struct pal_frame * frame = get_frame(uc);
 
@@ -350,8 +350,8 @@ void _DkHandleExternelEvent (PAL_NUM event, sgx_context_t * uc)
     if (!frame) {
         frame = __alloca(sizeof(struct pal_frame));
         frame->identifier = PAL_FRAME_IDENTIFIER;
-        frame->func = &_DkHandleExternelEvent;
-        frame->funcname = "_DkHandleExternelEvent";
+        frame->func = &_DkHandleExternalEvent;
+        frame->funcname = "_DkHandleExternalEvent";
         arch_store_frame(&frame->arch);
     }
 

Pal/src/host/Linux-SGX/enclave_entry.S

@@ -284,7 +284,7 @@ sgx_ocall:
 	pushq %rax
 	movq %rsi, %rdi
 	movq %rsp, %rsi
-	callq _DkHandleExternelEvent
+	callq _DkHandleExternalEvent
 	popq %rax
 .Lno_external_event:
 

Pal/src/host/Linux-SGX/sgx_entry.S

@@ -90,7 +90,7 @@ sgx_entry:
 sgx_entry_return:
 	# return to enclave, arguments:
 	# RDI - return value
-	# RSI - externel event
+	# RSI - external event
 	jmp .Ldo_ecall
 
 /*