lib/test-string_helpers.c: add string_get_size() tests
lib/test-string_helpers.c: add string_get_size() tests

Add a couple of simple tests for string_get_size().  The last one will
hang the kernel without the 'lib/string_helpers.c: fix infinite loop in
string_get_size()' fix.

Signed-off-by: Vitaly Kuznetsov <282517a3cdaae14e79e6d52f012bddb9ec2b7f0e@redhat.com>
Cc: James Bottomley <1acebbdca565c7b6b638bdc23b58b5610d1a56b8@Odin.com>
Cc: Andy Shevchenko <74f0c009df510614346aa771cd21959b78cdb413@linux.intel.com>
Cc: Rasmus Villemoes <ba324ca7b1c77fc20bb970d5aff6eea9377918a5@rasmusvillemoes.dk>
Cc: "K. Y. Srinivasan" <bcbf172338421f26297a2592698edf8cc84ecbef@microsoft.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs