BUG #18845: DEREF_OF_NULL.RET guc_malloc possibly returns NULL

The following bug has been logged on the website:

Bug reference: 18845
Logged by: Nikita
Email address: pm91(dot)arapov(at)gmail(dot)com
PostgreSQL version: 16.6
Operating system: ubuntu 20.04
Description:

guc_malloc possibly returns NULL, if no memory
I suggest the following patch fixing this issue

diff --git a/src/backend/commands/user.c b/src/backend/commands/user.c
--- a/src/backend/commands/user.c (revision
a49ac80219c6f28c3cf3973f797de637329952da)
+++ b/src/backend/commands/user.c (date 1740386879158)
@@ -2553,7 +2553,7 @@
pfree(rawstring);
list_free(elemlist);

- result = (unsigned *) guc_malloc(LOG, sizeof(unsigned));
+ result = (unsigned *) guc_malloc(FATAL, sizeof(unsigned));
*result = options;
*extra = result;