Fix some logical-not-parentheses warnings

cde/lib/DtSearch/raima/connect.c

@@ -121,7 +121,7 @@ int dbn  /* Database number */
       goto quit;
 
    /* ensure record not already connected to set */
-   if ( ! crmp.owner == NULL_DBA ) { 
+   if ( ! (crmp.owner == NULL_DBA) ) { 
       stat = dberr(S_ISOWNED);
       goto quit;
    }

cde/lib/tt/slib/mp_s_procid.C

@@ -100,7 +100,7 @@ add_message(const _Tt_s_message_ptr &m)
 {
 	_Tt_xdr_version			xvers(_version);
 
-	if (! _flags&(1<<_TT_PROC_ACTIVE)) {
+	if (! (_flags&(1<<_TT_PROC_ACTIVE))) {
 		_tt_syslog(0, LOG_ERR,
 			   catgets(_ttcatd, 2, 4,
 				   "A ToolTalk client died before it "

cde/programs/dtmail/dtmail/RoamCmds.C

@@ -4003,8 +4003,8 @@ VacationCmd::parseVacationMessage()
 	for (hnd = env->getFirstHeader(error, &name, value);
 	    error.isNotSet() && hnd;
 	    hnd = env->getNextHeader(error, hnd, &name, value)) {
-	    
-	    if (!strcmp(name, "Subject") == 0) {
+
+	    if (strcmp(name, "Subject")) {
 		continue;
 	    }
 	    else {