efi: Fix several memory leaks of UEFI handles

Fix possible and absolute memory leaks of "handles"
returned by grub_efi_locate_handle() using grub_malloc().

Signed-off-by: Khalid Ali <khaliidcaliy@gmail.com>
Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/commands/efi/lsefi.c

@@ -129,6 +129,7 @@ grub_cmd_lsefi (grub_command_t cmd __attribute__ ((unused)),
 
     }
 
+  grub_free (handles);
   return 0;
 }