pktgen: Avoid out-of-range in get_imix_entries

In get_imit_enries() pkt_dev->n_imix_entries = MAX_IMIX_ENTRIES
leads to oob for pkt_dev->imix_entries array.
```
UBSAN: array-index-out-of-bounds in net/core/pktgen.c:874:24
index 20 is out of range for type 'imix_pkt [20]'
CPU: 2 PID: 1210 Comm: bash Not tainted 6.10.0-rc1 torvalds#121
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
Call Trace:
<TASK>
dump_stack_lvl lib/dump_stack.c:117
__ubsan_handle_out_of_bounds lib/ubsan.c:429
get_imix_entries net/core/pktgen.c:874
pktgen_if_write net/core/pktgen.c:1063
pde_write fs/proc/inode.c:334
proc_reg_write fs/proc/inode.c:346
vfs_write fs/read_write.c:593
ksys_write fs/read_write.c:644
do_syscall_64 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:130
RIP: 0033:0x7f148408b240
```

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 52a62f8 ("pktgen: Parse internet mix (imix) input")
Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
Signed-off-by: NipaLocal <nipa@local>

net/core/pktgen.c

@@ -881,7 +881,7 @@ static ssize_t get_imix_entries(const char __user *buffer,
 		i++;
 		pkt_dev->n_imix_entries++;
 
-		if (pkt_dev->n_imix_entries > MAX_IMIX_ENTRIES)
+		if (pkt_dev->n_imix_entries >= MAX_IMIX_ENTRIES)
 			return -E2BIG;
 	} while (c == ' ');