engines: separate declaration and assignment

Separate the declaraction and assignment for some variables.

This is a prep patch for a Coccinelle script that converts
mallloc+memset(,0,) to calloc.

Part of this patch was created using the Coccinelle script below.

@@
identifier x;
expression y;
statement s;
type T;
@@

-T x = malloc(y);
+T x;
+x = malloc(y);
(
if (!x) s
|
if (x == NULL) s
|
)
memset(x, 0, y);

Signed-off-by: Vincent Fu <[email protected]>

engines/null.c

@@ -106,7 +106,8 @@ static void null_cleanup(struct null_data *nd)
 
 static struct null_data *null_init(struct thread_data *td)
 {
-	struct null_data *nd = malloc(sizeof(*nd));
+	struct null_data *nd;
+	nd = malloc(sizeof(*nd));
 
 	memset(nd, 0, sizeof(*nd));
 

engines/posixaio.c

@@ -197,7 +197,8 @@ static void fio_posixaio_cleanup(struct thread_data *td)
 
 static int fio_posixaio_init(struct thread_data *td)
 {
-	struct posixaio_data *pd = malloc(sizeof(*pd));
+	struct posixaio_data *pd;
+	pd = malloc(sizeof(*pd));
 
 	memset(pd, 0, sizeof(*pd));
 	pd->aio_events = malloc(td->o.iodepth * sizeof(struct io_u *));

engines/solarisaio.c

@@ -186,7 +186,8 @@ static void fio_solarisaio_init_sigio(void)
 static int fio_solarisaio_init(struct thread_data *td)
 {
 	unsigned int max_depth;
-	struct solarisaio_data *sd = malloc(sizeof(*sd));
+	struct solarisaio_data *sd;
+	sd = malloc(sizeof(*sd));
 	memset(sd, 0, sizeof(*sd));
 
 	max_depth = td->o.iodepth;