lmbench: lat_rpc: fix stray pointer

lmbench: lat_rpc: fix stray pointer

| # ./lat_rpc -S localhost
| potentially unexpected fatal signal 11.
| Path: /lmbench/bin/arc64/lat_rpc
| CPU: 0 PID: 62 Comm: lat_rpc Not tainted 5.6.0-00224-g8e1b159f529e #39
| Invalid Read @ 0x00000001 by insn @ 0x2011f110
|   @off 0x6c110 in [/lib/libc-2.32.so]  VMA: 0x200b3000 to 0x201b8000
| ECR: 0x00050100 EFA: 0x00000001 ERET: 0x2011f110
| STAT32: 0x80081082 [IE U     ]   BTA: 0x2011b87c
|  SP: 0x5fffefe8  FP: 0x00000000 BLK: 0x20103242
| r00: 0x00000001 r01: 0x00000002 r02: 0x00000001
| r03: 0x20101eb0 r04: 0x00000001 r05: 0x00000001
| r06: 0x00000000 r07: 0x00000000 r08: 0x00000001
| r09: 0x2019d8b0 r10: 0x20039fc4 r11: 0x5ffff0f0
| r12: 0x2019d6d0 r13: 0x2019d748 r14: 0x5ffff588
| r15: 0x00000000 r16: 0x00000000 r17: 0x5ffff708
| r18: 0x20039fc0 r19: 0xffffffff r20: 0x201ba010
| r21: 0x00000000 r22: 0x00000000 r23: 0x20039fc0
| r24: 0x00000bd0 r25: 0x00000073
Segmentation fault

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>