v4l2: fix format warnings

GCC and Linux do not agree on the underlying type -long or long long-
for fixed size 64-bits integer on 64-bits architectures.

modules/access/v4l2/controls.c

@@ -683,11 +683,12 @@ static vlc_v4l2_ctrl_t *ControlAddIntMenu (vlc_object_t *obj, int fd,
 
         if (v4l2_ioctl (fd, VIDIOC_QUERYMENU, &menu) < 0)
             continue;
-        msg_Dbg (obj, "  choice %"PRIu32") %"PRId64, menu.index, menu.value);
+        msg_Dbg (obj, "  choice %"PRIu32") %"PRId64, menu.index,
+                 (uint64_t)menu.value);
 
         vlc_value_t text;
         val.i_int = menu.index;
-        sprintf (name, "%"PRId64, menu.value);
+        sprintf (name, "%"PRId64, (int64_t)menu.value);
         text.psz_string = name;
         var_Change (obj, c->name, VLC_VAR_ADDCHOICE, &val, &text);
     }

modules/access/v4l2/video.c

@@ -61,11 +61,11 @@ static int SetupStandard (vlc_object_t *obj, int fd,
     }
     if (v4l2_ioctl (fd, VIDIOC_S_STD, std) < 0)
     {
-        msg_Err (obj, "cannot set video standard 0x%"PRIx64": %s", *std,
-                 vlc_strerror_c(errno));
+        msg_Err (obj, "cannot set video standard 0x%"PRIx64": %s",
+                 (uint64_t)*std, vlc_strerror_c(errno));
         return -1;
     }
-    msg_Dbg (obj, "video standard set to 0x%"PRIx64":", *std);
+    msg_Dbg (obj, "video standard set to 0x%"PRIx64":", (uint64_t)*std);
     return 0;
 }