loader: Don't reserve space for symbols twice.

The current code bumps lastaddr twice for the symbol table
location. However, the first bump is bogus and results in wasted
space. Remove it.

PR:			110995
Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D31017

stand/common/load_elf_obj.c

@@ -282,8 +282,6 @@ __elfN(obj_loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
 		case SHT_SYMTAB:
 			nsym++;
 			ef->symtabindex = i;
-			shdr[i].sh_addr = (Elf_Addr)lastaddr;
-			lastaddr += shdr[i].sh_size;
 			break;
 		}
 	}