RISC-V: Fix the static-PIE non-relocated object check

The value of l_scope is only valid post relocation, so this original
check was triggering undefined behavior.  Instead just directly check to
see if the object has been relocated, at which point using l_scope is
safe.

Reported-by: Andreas Schwab <schwab@suse.de>
Closes: BZ #31317
Fixes: e0590f41fe ("RISC-V: Enable static-pie.")
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

sysdeps/riscv/dl-machine.h

@@ -348,7 +348,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
       gotplt[1] = (ElfW(Addr)) l;
     }
 
-  if (l->l_type == lt_executable && l->l_scope != NULL)
+  if (l->l_type == lt_executable && l->l_relocated)
     {
       /* The __global_pointer$ may not be defined by the linker if the
 	 $gp register does not be used to access the global variable