[libgtop] Declare functions as `static` to silence clang warnings

[Robert Roth <robertroth src gnome org>]

commit f5ced2028d1edb81c710c756859b9abb0d866e16
Author: Avinash Sonawane <rootkea gmail com>
Date:   Mon Dec 20 13:04:40 2021 +0530

    Declare functions as `static` to silence clang warnings

 sysdeps/linux/disk.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/sysdeps/linux/disk.c b/sysdeps/linux/disk.c
index 86d19652..89acd686 100644
--- a/sysdeps/linux/disk.c
+++ b/sysdeps/linux/disk.c
@@ -47,7 +47,7 @@ _glibtop_init_disk_s (glibtop *server)
 
 // Handle LVM and RAID //
 
-void
+static void
 find_primary_part (partition_info *primary_part, const char *m)
 {
        int n = 0, tlvl = 0;
@@ -175,7 +175,7 @@ find_primary_part (partition_info *primary_part, const char *m)
        }
 }
 
-int
+static int
 is_virtual_drive (partition_info *primary_part, const char *p)
 {
        int i;
@@ -207,7 +207,7 @@ is_virtual_drive (partition_info *primary_part, const char *p)
        return test;
 }
 
-int
+static int
 max_lines (const char *p)
 {
        char temp[10];