bcachefs: fix security warning in pr_name_and_units

Signed-off-by: Daniel Hill <daniel@gluo.nz>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/util.c

@@ -436,7 +436,7 @@ static void bch2_pr_time_units_aligned(struct printbuf *out, u64 ns)
 
 static inline void pr_name_and_units(struct printbuf *out, const char *name, u64 ns)
 {
-	prt_printf(out, name);
+	prt_str(out, name);
 	prt_tab(out);
 	bch2_pr_time_units_aligned(out, ns);
 	prt_newline(out);