[nginx] enhance options

[洪志道]

Hi!

Maybe it's better to keep the options more complete, and consider the
follow operation as a mistake.

/usr/local/nginx/sbin/nginx -

hg diff
diff -r cbf59d483c9c src/core/nginx.c
--- a/src/core/nginx.c Tue Jan 16 13:52:03 2018 +0300
+++ b/src/core/nginx.c Sun Feb 04 07:41:36 2018 -0500
@@ -753,7 +753,12 @@
             return NGX_ERROR;
         }

-        while (*p) {
+        do {
+
+            if (*p == '\0') {
+                ngx_log_stderr(0, "missing option: \"%s\"", argv[i]);
+                return NGX_ERROR;
+            }

             switch (*p++) {

@@ -855,7 +860,8 @@
                 ngx_log_stderr(0, "invalid option: \"%c\"", *(p - 1));
                 return NGX_ERROR;
             }
-        }
+
+        } while (*p);

     next:

Thanks.
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