dtlogin: start to resolve static analysis warnings

Also convert some K&R function declarations to ansi

cde/programs/dtlogin/qualify.c

@@ -49,8 +49,8 @@ char * qualifyWithFirst
   char * searchPath
   )
 {
-char * paths = strdup(searchPath);
-char * savepaths = paths;
+char * paths = NULL;
+char * savepaths = NULL;
 char * path;
 char * chance;
 FILE * f;
@@ -60,6 +60,9 @@ FILE * f;
   if (filename == NULL || searchPath == NULL)
     return NULL;
 
+  paths = strdup(searchPath);
+  savepaths = paths;
+
   while (1) {
 
     /* if there is a :, zero it */