submodule: remove extra line feeds between callback struct and macro

Many `submodule--helper` subcommands follow the convention that a struct
defines their callback data, and the declaration of that struct is
followed immediately by a macro to use in static initializers, without
any separating empty line.

Let's align the `init`, `status` and `sync` subcommands with that convention.

Mentored-by: Christian Couder <[email protected]>
Mentored-by: Kaartic Sivaraam <[email protected]>
Helped-by: Johannes Schindelin <[email protected]>
Helped-by: Philip Oakley <[email protected]>
Signed-off-by: Shourya Shukla <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: periperidip

builtin/submodule--helper.c

@@ -612,7 +612,6 @@ struct init_cb {
 	const char *prefix;
 	unsigned int flags;
 };
-
 #define INIT_CB_INIT { NULL, 0 }
 
 static void init_submodule(const char *path, const char *prefix,
@@ -742,7 +741,6 @@ struct status_cb {
 	const char *prefix;
 	unsigned int flags;
 };
-
 #define STATUS_CB_INIT { NULL, 0 }
 
 static void print_status(unsigned int flags, char state, const char *path,
@@ -933,7 +931,6 @@ struct sync_cb {
 	const char *prefix;
 	unsigned int flags;
 };
-
 #define SYNC_CB_INIT { NULL, 0 }
 
 static void sync_submodule(const char *path, const char *prefix,