cosmetic: apply changes to match struct_endianess.py output

gsm48_pag_resp and gsm48_service_request: omit comments in big endian part.
dtap_header: better segment the substruct.
gsm23041_msg_param_gsm: match up whitespace / comments.

Rationale: the script is a good way to avoid bugs from manually composing the
big endian parts (for example, it detected the missing endian.h include, fixed
in I593cc5e8272469b570559206bb02b6e79797340b). However, it becomes cumbersome
if it creates numerous edits in the source tree, which cause more time spent
for whoever wanted to rather save time with it. So let's keep the code tree
matching that struct's output.

Change-Id: I7432f5337d6589262c31f5186dfd0ac32221c467
diff --git a/include/osmocom/gsm/protocol/gsm_04_08.h b/include/osmocom/gsm/protocol/gsm_04_08.h
index 1bca068..f8f2eab 100644
--- a/include/osmocom/gsm/protocol/gsm_04_08.h
+++ b/include/osmocom/gsm/protocol/gsm_04_08.h
@@ -664,7 +664,7 @@
 /* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
 	uint8_t key_seq:4, spare:4;
 	union {
-		uint32_t classmark2;  /* Backward compatibility */
+		uint32_t classmark2;
 		struct {
 			uint8_t cm2_len;
 			struct gsm48_classmark2 cm2;
@@ -815,7 +815,7 @@
 /* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
 	uint8_t cipher_key_seq:4, cm_service_type:4;
 	union {
-		uint32_t classmark;  /* Backward compatibility */
+		uint32_t classmark;
 		struct {
 			uint8_t cm2_len;
 			struct gsm48_classmark2 classmark2;
diff --git a/include/osmocom/gsm/protocol/gsm_08_08.h b/include/osmocom/gsm/protocol/gsm_08_08.h
index e791b07..d8a7773 100644
--- a/include/osmocom/gsm/protocol/gsm_08_08.h
+++ b/include/osmocom/gsm/protocol/gsm_08_08.h
@@ -41,27 +41,21 @@
 } __attribute__((packed));
 
 struct dtap_header {
-#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t type;
 	union {
 		uint8_t link_id;  /* Backward compatibility */
 		struct {
+#if OSMO_IS_LITTLE_ENDIAN
 			uint8_t dlci_cc:2,
 			dlci_spare:3,
 			dlci_sapi:3; /* enum gsm0406_dlc_sapi */
-		};
-	};
-	uint8_t length;
 #elif OSMO_IS_BIG_ENDIAN
-	uint8_t type;
-	union {
-		uint8_t link_id;
-		struct {
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
 			uint8_t dlci_sapi:3, dlci_spare:3, dlci_cc:2;
+#endif
 		};
 	};
 	uint8_t length;
-#endif
 } __attribute__((packed));
 
 /* Data Link Control SAPI, GSM 08.06 § 6.3.2, GSM 04.06 § 3.3.3 */
diff --git a/include/osmocom/gsm/protocol/gsm_23_041.h b/include/osmocom/gsm/protocol/gsm_23_041.h
index e60c324..e726cff 100644
--- a/include/osmocom/gsm/protocol/gsm_23_041.h
+++ b/include/osmocom/gsm/protocol/gsm_23_041.h
@@ -11,9 +11,9 @@
 #if OSMO_IS_LITTLE_ENDIAN
 		uint8_t num_pages:4,
 			page_nr:4;
-#else
-		uint8_t page_nr:4,
-			num_pages:4;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+		uint8_t page_nr:4, num_pages:4;
 #endif
 	} page_param;
 	uint8_t content[0];