initialize pn in ft_getpnames() parse.c

initialize dwLen in tesCreateSystemInfo() in com_sysinfo.c
Both were reported by MSVC Code Analysis
Crash of ngspice.dll in Eeschema is thus removed
(hopefully in general)

src/frontend/com_sysinfo.c

@@ -384,7 +384,7 @@ tesCreateSystemInfo(TesSystemInfo *info)
     OSVERSIONINFOA version;
     char *versionStr = NULL, *procStr, *freeStr;
     DWORD major, minor;
-    DWORD dwLen;
+    DWORD dwLen = 0;
     HKEY hkBaseCPU;
     LONG lResult;
 

src/frontend/parse.c

@@ -32,7 +32,7 @@ void db_print_pnode_tree(struct pnode *p, char *print);
 struct pnode *
 ft_getpnames(wordlist *wl, bool check)
 {
-    struct pnode *pn;
+    struct pnode *pn = NULL;
     char *xsbuf, *sbuf;
     int rv;