modpost: fix off by one in is_executable_section()

The > comparison should be >= to prevent an out of bounds array
access.

Fixes: 52dc0595 ("modpost: handle relocations mismatch in __ex_table.")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/mod/modpost.c

@@ -1141,7 +1141,7 @@ static Elf_Sym *find_tosym(struct elf_info *elf, Elf_Addr addr, Elf_Sym *sym)
 
 static bool is_executable_section(struct elf_info *elf, unsigned int secndx)
 {
-	if (secndx > elf->num_sections)
+	if (secndx >= elf->num_sections)
 		return false;
 
 	return (elf->sechdrs[secndx].sh_flags & SHF_EXECINSTR) != 0;