fix callPreceded filtering (#213)

[captainGeech42]

$ python ROPgadget.py --binary ntdll.dll --callPreceded | head -10
Options().removeNonCallPreceded(): Filtered out 70230 gadgets.
Gadgets information
============================================================
0x00000001800c2bcc : adc ah, al ; std ; call qword ptr [rax - 0x5268d17]
0x0000000180018016 : adc al, 0 ; add al, byte ptr [rax] ; add byte ptr [rax], al ; jmp 0x180017ffb
0x000000018001802e : adc al, 0 ; jmp 0x180017ff6
0x00000001801071d8 : adc al, 0x1a ; add byte ptr [rax], al ; jmp 0x1801072e6
0x000000018000d82e : adc al, 0x24 ; xor r12d, r12d ; jmp 0x18000cfbf
0x000000018005a648 : adc al, 0x41 ; add al, 0 ; jmp 0x18005a607
0x00000001800c9b94 : adc al, 0x42 ; jne 0x1800c9b8e ; lea r11d, [rax + 1] ; jmp 0x1800827bb

[captainGeech42]

@SweetVishnya PTAL

[SweetVishnya]

Thank you!