df plugin: fix implicit conversion warning

  CC       src/df.lo
src/df.c:231:15: warning: implicit conversion loses integer precision: 'unsigned long' to 'int' [-Wshorten-64-to-32]
        len = strlen(disk_name);
            ~ ^~~~~~~~~~~~~~~~~
1 warning generated.

diff --git a/src/df.c b/src/df.c
index e3aa453..8877b74 100644 (file)
--- a/src/df.c
+++ b/src/df.c
@@ -225,12 +225,10 @@ static int df_read(void) {
       if (strcmp(mnt_ptr->dir, "/") == 0)
         sstrncpy(disk_name, "root", sizeof(disk_name));
       else {
-        int len;
-
         sstrncpy(disk_name, mnt_ptr->dir + 1, sizeof(disk_name));
-        len = strlen(disk_name);
+        size_t len = strlen(disk_name);
 
-        for (int i = 0; i < len; i++)
+        for (size_t i = 0; i < len; i++)
           if (disk_name[i] == '/')
             disk_name[i] = '-';
       }