[PATCH] ole32: Fix STGMEDIUM* is NULL Invalid reference.

[Chao Long]

Wine-dbg>disas ReleaseStgMedium
0x7e240b48 ReleaseStgMedium [Z:\home\deepin\maintain5.0-stable\deepin-wine\dlls\ole32\ole2.c:2065] in ole32: lea ecx, [esp+0x4] 
0x7e240b4c ReleaseStgMedium+0x4 [Z:\home\deepin\maintain5.0-stable\deepin-wine\dlls\ole32\ole2.c:2065] in ole32: and esp, 0xfffffff0 
0x7e240b4f ReleaseStgMedium+0x7 [Z:\home\deepin\maintain5.0-stable\deepin-wine\dlls\ole32\ole2.c:2065] in ole32: push dword [ecx-0x4] 
0x7e240b52 ReleaseStgMedium+0xa [Z:\home\deepin\maintain5.0-stable\deepin-wine\dlls\ole32\ole2.c:2065] in ole32: push ebp 
0x7e240b53 ReleaseStgMedium+0xb [Z:\home\deepin\maintain5.0-stable\deepin-wine\dlls\ole32\ole2.c:2065] in ole32: mov ebp, esp 
0x7e240b55 ReleaseStgMedium+0xd [Z:\home\deepin\maintain5.0-stable\deepin-wine\dlls\ole32\ole2.c:2065] in ole32: push ebx 
0x7e240b56 ReleaseStgMedium+0xe [Z:\home\deepin\maintain5.0-stable\deepin-wine\dlls\ole32\ole2.c:2065] in ole32: push ecx 
0x7e240b57 ReleaseStgMedium+0xf [Z:\home\deepin\maintain5.0-stable\deepin-wine\dlls\ole32\ole2.c:2065] in ole32: sub esp, 0x10 
0x7e240b5a ReleaseStgMedium+0x12 [Z:\home\deepin\maintain5.0-stable\deepin-wine\dlls\ole32\ole2.c:2065] in ole32: mov ebx, ecx

Wine-dbg>info regs
Register dump:
 CS:0023 SS:002b DS:002b ES:002b FS:0063 GS:006b
 EIP:7e240b48 ESP:00300b68 EBP:00300b74 EFLAGS:00000202(   - --  I   - - - )
 EAX:1b690930 EBX:098b6178 ECX:13cd8044 EDX:1b686001
 ESI:13cd8040 EDI:090fcdd4

Wine-dbg>x 0x00300b6c
 0x00000000

Wine-dbg>info break
Breakpoints:
1: y 0x7e240b48 ReleaseStgMedium [Z:\home\deepin\maintain5.0-stable\deepin-wine\dlls\ole32\ole2.c:2065] in ole32 (1)
No watchpoints

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