proc: use "unsigned int" in proc_fill_cache()

All those lengths are unsigned as they should be.

Link: http://lkml.kernel.org/r/20180423213751.GC9043@avx2
Signed-off-by: Alexey Dobriyan <[e-mail]>
Reviewed-by: Andrew Morton <[e-mail]>
Cc: Al Viro <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/proc/base.c

···
  * by stat.
  */
 bool proc_fill_cache(struct file *file, struct dir_context *ctx,
-	const char *name, int len,
+	const char *name, unsigned int len,
 	instantiate_t instantiate, struct task_struct *task, const void *ptr)
 {
 	struct dentry *child, *dir = file->f_path.dentry;
···
 	     iter.task;
 	     iter.tgid += 1, iter = next_tgid(ns, iter)) {
 		char name[10 + 1];
-		int len;
+		unsigned int len;
 
 		cond_resched();
 		if (!has_pid_permissions(ns, iter.task, HIDEPID_INVISIBLE))
···
 	     task;
 	     task = next_tid(task), ctx->pos++) {
 		char name[10 + 1];
-		int len;
+		unsigned int len;
 		tid = task_pid_nr_ns(task, ns);
 		len = snprintf(name, sizeof(name), "%u", tid);
 		if (!proc_fill_cache(file, ctx, name, len,

fs/proc/fd.c

···
 		struct file *f;
 		struct fd_data data;
 		char name[10 + 1];
-		int len;
+		unsigned int len;
 
 		f = fcheck_files(files, fd);
 		if (!f)

fs/proc/internal.h

···
 /* Lookups */
 typedef struct dentry *instantiate_t(struct dentry *,
 				     struct task_struct *, const void *);
-extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int,
+bool proc_fill_cache(struct file *, struct dir_context *, const char *, unsigned int,
 			   instantiate_t, struct task_struct *, const void *);
 
 /*