md5sum return value fix

[Matthias Wenzel]

"md5 has been broken" ... and fixed :)

without the fix below md5sum will always report a correct md5 on _any_ 
wrongly formattet input files.
In my application case it led to a integrity/security breach.

m

diff -Nur svn-orig/busybox/coreutils/md5_sha1_sum.c 
svn/busybox/coreutils/md5_sha1_sum.c
--- svn-orig/busybox/coreutils/md5_sha1_sum.c   2005-10-27 
14:47:45.000000000 +0200
+++ svn/busybox/coreutils/md5_sha1_sum.c        2005-10-27 
14:59:34.000000000 +0200
@@ -121,6 +121,8 @@
                                 if (flags & FLAG_WARN) {
                                         bb_error_msg("Invalid format");
                                 }
+                               count_failed++;
+                               return_value = EXIT_FAILURE;
                                 free(line);
                                 continue;
                         }