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/apps/ecparam.c b/apps/ecparam.c
index 5ceaec7..755b1be 100644
--- a/apps/ecparam.c
+++ b/apps/ecparam.c
@@ -265,11 +265,11 @@
          * are the same as the curves prime192v1 and prime256v1 defined in
          * X9.62)
          */
-        if (!strcmp(curve_name, "secp192r1")) {
+        if (strcmp(curve_name, "secp192r1") == 0) {
             BIO_printf(bio_err, "using curve name prime192v1 "
                        "instead of secp192r1\n");
             nid = NID_X9_62_prime192v1;
-        } else if (!strcmp(curve_name, "secp256r1")) {
+        } else if (strcmp(curve_name, "secp256r1") == 0) {
             BIO_printf(bio_err, "using curve name prime256v1 "
                        "instead of secp256r1\n");
             nid = NID_X9_62_prime256v1;