Use "==0" instead of "!strcmp" etc

For the various string-compare routines (strcmp, strcasecmp, str.*cmp)
use "strcmp()==0" instead of "!strcmp()"

Reviewed-by: Tim Hudson <tjh@openssl.org>
diff --git a/demos/bio/server-arg.c b/demos/bio/server-arg.c
index 4f65227..b188f6a 100644
--- a/demos/bio/server-arg.c
+++ b/demos/bio/server-arg.c
@@ -52,7 +52,7 @@
         if (rv > 0)
             continue;
         /* Otherwise application specific argument processing */
-        if (!strcmp(*args, "-port")) {
+        if (strcmp(*args, "-port") == 0) {
             port = args[1];
             if (port == NULL) {
                 fprintf(stderr, "Missing -port argument\n");