kernel/freebsd: fix function parameter list

[ upstream commit 12b7ef3c4a6262e1c0f747bd0037a3a8df38ab4c ]

Functions which take no parameters should explicitly have "(void)" as
the parameter list, rather than "()".

Reported upstream on FreeBSD ports collection [1].

[1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271524

Fixes: 764bf26 ("add FreeBSD support")

Reported-by: John Baldwin <jhb@freebsd.org>
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Tyler Retzlaff <roretzla@linux.microsoft.com>

kernel/freebsd/contigmem/contigmem.c

@@ -111,7 +111,7 @@ static struct cdevsw contigmem_ops = {
 };
 
 static int
-contigmem_load()
+contigmem_load(void)
 {
 	char index_string[8], description[32];
 	int  i, error = 0;
@@ -178,7 +178,7 @@ contigmem_load()
 }
 
 static int
-contigmem_unload()
+contigmem_unload(void)
 {
 	int i;