vim-patch:8.2.0087: crash in command line expansion when out of memory

Problem:    Crash in command line expansion when out of memory.
Solution:   Check for NULL pointer.  Also make ExpandGeneric() static.
            (Dominique Pelle, closes vim/vim#5437)
vim/vim@61d7c0d

N/A patches for version.c:

vim-patch:8.2.1892: valgrind warns for using uninitialized access in tests

Problem:    Valgrind warns for using uninitialized access in tests.
Solution:   Fix condition for breaking out of loop. (Dominique Pellé,
            closes vim/vim#7187)
vim/vim@9c24cd1

vim-patch:8.2.1896: valgrind warns for using uninitialized memory

Problem:    Valgrind warns for using uninitialized memory.
Solution:   NUL terminate the SmcOpenConnection() error message. (Dominique
            Pellé, closes vim/vim#7194)
vim/vim@e1be118

src/nvim/ex_getln.c

@@ -5193,7 +5193,7 @@ ExpandFromContext (
  * obtain strings, one by one.	The strings are matched against a regexp
  * program.  Matching strings are copied into an array, which is returned.
  */
-void ExpandGeneric(
+static void ExpandGeneric(
     expand_T    *xp,
     regmatch_T  *regmatch,
     int         *num_file,