powerpc64/modules: correctly iterate over stubs in setup_ftrace_ool_stubs

JIRA: https://issues.redhat.com/browse/RHEL-113085

commit f6b4df3
Author: Joe Lawrence <joe.lawrence@redhat.com>
Date:   Fri Sep 12 10:27:39 2025 -0400

    powerpc64/modules: correctly iterate over stubs in setup_ftrace_ool_stubs

    CONFIG_PPC_FTRACE_OUT_OF_LINE introduced setup_ftrace_ool_stubs() to
    extend the ppc64le module .stubs section with an array of
    ftrace_ool_stub structures for each patchable function.

    Fix its ppc64_stub_entry stub reservation loop to properly write across
    all of the num_stubs used and not just the first entry.

    Fixes: eec3796 ("powerpc64/ftrace: Move ftrace sequence out of line")
    Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
    Acked-by: Naveen N Rao (AMD) <naveen@kernel.org>
    Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
    Link: https://patch.msgid.link/20250912142740.3581368-3-joe.lawrence@redhat.com

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>

Author: joe-lawrence

arch/powerpc/kernel/module_64.c

@@ -1119,7 +1119,7 @@ static int setup_ftrace_ool_stubs(const Elf64_Shdr *sechdrs, unsigned long addr,
 
 	/* reserve stubs */
 	for (i = 0; i < num_stubs; i++)
-		if (patch_u32((void *)&stub->funcdata, PPC_RAW_NOP()))
+		if (patch_u32((void *)&stub[i].funcdata, PPC_RAW_NOP()))
 			return -1;
 #endif