Fixed a segfault on Windows.

libssh/misc.c

@@ -72,7 +72,7 @@
 #ifdef _WIN32
 char *ssh_get_user_home_dir(void) {
   char tmp[MAX_PATH] = {0};
-  char szPath = NULL;
+  char *szPath = NULL;
 
   if (SHGetSpecialFolderPathA(NULL, tmp, CSIDL_PROFILE, TRUE)) {
     szPath = malloc(strlen(tmp) + 1);