libbb: eliminate a static data array in bb_mode_string()

function                                             old     new   delta
print_stat                                           861     869      +8
header_verbose_list_ar                                73      77      +4
display_single                                       975     979      +4
header_verbose_list                                  237     239      +2
bb_mode_string                                       124     115      -9
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/1 up/down: 18/-9)               Total: 9 bytes
   text	   data	    bss	    dec	    hex	filename
1043136	    559	   5052	1048747	 1000ab	busybox_old
1043153	    559	   5020	1048732	 10009c	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/coreutils/chmod.c b/coreutils/chmod.c
index 8e3e138..5832cc5 100644
--- a/coreutils/chmod.c
+++ b/coreutils/chmod.c
@@ -91,8 +91,9 @@
 		 || (OPT_CHANGED
 		     && (statbuf->st_mode & 07777) != (newmode & 07777))
 		) {
+			char modestr[12];
 			printf("mode of '%s' changed to %04o (%s)\n", fileName,
-				newmode & 07777, bb_mode_string(newmode)+1);
+				newmode & 07777, bb_mode_string(modestr, newmode)+1);
 		}
 		return TRUE;
 	}