gcc7: fix format truncation warning

detect-rpc.c: In function ‘DetectRpcParse’:
detect-rpc.c:225:50: error: ‘%s’ directive argument is null [-Werror=format-truncation=]
                 SCLogError(SC_ERR_INVALID_VALUE, "invalid rpc option %s",args[i]);
                                                  ^
util-debug.h:239:77: note: in definition of macro ‘SCLogErr’
             int _sc_log_ret = snprintf(_sc_log_msg, SC_LOG_MAX_LOG_MSG_LEN, __VA_ARGS__);   \
                                                                             ^~~~~~~~~~~
detect-rpc.c:225:17: note: in expansion of macro ‘SCLogError’
                 SCLogError(SC_ERR_INVALID_VALUE, "invalid rpc option %s",args[i]);
                 ^~~~~~~~~~

src/detect-rpc.c

@@ -190,7 +190,7 @@ DetectRpcData *DetectRpcParse (char *rpcstr)
     rd->procedure = 0;
 
     int i;
-    for (i = 0; i < (ret -1); i++) {
+    for (i = 0; i < (ret - 1); i++) {
         if (args[i]) {
             switch (i) {
                 case 0:
@@ -199,7 +199,7 @@ DetectRpcData *DetectRpcParse (char *rpcstr)
                         goto error;
                     }
                     rd->flags |= DETECT_RPC_CHECK_PROGRAM;
-                break;
+                    break;
                 case 1:
                     if (args[i][0] != '*') {
                         if (ByteExtractStringUint32(&rd->program_version, 10, strlen(args[i]), args[i]) <= 0) {
@@ -208,7 +208,7 @@ DetectRpcData *DetectRpcParse (char *rpcstr)
                         }
                         rd->flags |= DETECT_RPC_CHECK_VERSION;
                     }
-                break;
+                    break;
                 case 2:
                     if (args[i][0] != '*') {
                         if (ByteExtractStringUint32(&rd->procedure, 10, strlen(args[i]), args[i]) <= 0) {
@@ -218,11 +218,11 @@ DetectRpcData *DetectRpcParse (char *rpcstr)
                         rd->flags |= DETECT_RPC_CHECK_PROCEDURE;
                     }
                 break;
-                }
-            } else {
-                SCLogError(SC_ERR_INVALID_VALUE, "invalid rpc option %s",args[i]);
-                goto error;
             }
+        } else {
+            SCLogError(SC_ERR_INVALID_VALUE, "invalid rpc option %s",rpcstr);
+            goto error;
+        }
     }
     for (i = 0; i < (ret -1); i++){
         if (args[i] != NULL)