coredump: mark struct mm_struct as const

We don't actually modify it.

Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Christian Brauner <[e-mail]>

fs/coredump.c

···
 	size_t *argv __free(kfree) = NULL;
 	struct core_state core_state;
 	struct core_name cn;
-	struct mm_struct *mm = current->mm;
+	const struct mm_struct *mm = current->mm;
 	const struct linux_binfmt *binfmt = mm->binfmt;
 	const struct cred *old_cred;
 	int argc = 0;

include/linux/sched/coredump.h

···
 #define SUID_DUMP_USER		1	/* Dump as user of process */
 #define SUID_DUMP_ROOT		2	/* Dump as root */
 
-static inline unsigned long __mm_flags_get_dumpable(struct mm_struct *mm)
+static inline unsigned long __mm_flags_get_dumpable(const struct mm_struct *mm)
 {
 	/*
 	 * By convention, dumpable bits are contained in first 32 bits of the