bootm: move lmb into the bootm_headers_t structure

To allow for persistent state between future bootm subcommands we
need the lmb to exist in a global state.
Moving it into the bootm_headers_t allows us to do that.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/lib_sparc/bootm.c b/lib_sparc/bootm.c
index 71d34ba..aac05e4 100644
--- a/lib_sparc/bootm.c
+++ b/lib_sparc/bootm.c
@@ -93,7 +93,7 @@
 	unsigned int data, len, checksum;
 	unsigned int initrd_addr, kernend;
 	void (*kernel) (struct linux_romvec *, void *);
-	struct lmb *lmb = images->lmb;
+	struct lmb *lmb = &images->lmb;
 	int ret;
 
 	if (images->legacy_hdr_valid) {