bootm: refactor do_reset and os boot function args

There is no need for each OS specific function to call do_reset() we
can just do it once in bootm. This means its feasible on an error for
the OS boot function to return.

Also, remove passing in cmd_tbl_t as its not needed by the OS boot
functions.  flag isn't currently used but might be in the future so
we left it alone.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/lib_microblaze/bootm.c b/lib_microblaze/bootm.c
index baf6d77..5986a31 100644
--- a/lib_microblaze/bootm.c
+++ b/lib_microblaze/bootm.c
@@ -32,10 +32,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
-
-void do_bootm_linux (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[],
-		     bootm_headers_t *images)
+int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 {
 	/* First parameter is mapped to $r5 for kernel boot args */
 	void	(*theKernel) (char *);
@@ -52,9 +49,6 @@
 
 	theKernel (commandline);
 	/* does not return */
-	return;
-
 error:
-	do_reset (cmdtp, flag, argc, argv);
-	return;
+	return 1;
 }