fuzz TEST add fuzz corpus input for invalid YANG module name memory leak

Add fuzz regression test case for parse_module leak when module name
contained characters that don't satisfy is_yangidentchar().

The leak was found by OSS-Fuzz in lys_parse_mem.

Signed-off-by: Juraj Vijtiuk <juraj.vijtiuk@sartura.hr>
diff --git a/tests/fuzz/corpus/lys_parse_mem/pull1524.yang b/tests/fuzz/corpus/lys_parse_mem/pull1524.yang
new file mode 100644
index 0000000..c39fc92
--- /dev/null
+++ b/tests/fuzz/corpus/lys_parse_mem/pull1524.yang
@@ -0,0 +1 @@
+module ''+'c 
\ No newline at end of file