Only try loading driver from disk if the driver name ends with .xmq and is a valid file.

src/driver_dynamic.cc

@@ -22,6 +22,9 @@
 
 bool DriverDynamic::load(DriverInfo *di, const string &file)
 {
+    if (!endsWith(file, ".xmq")) return false;
+    if (!checkFileExists(file.c_str())) return false;
+
     XMQDoc *doc = xmqNewDoc();
 
     bool ok = xmqParseFile(doc, file.c_str(), "config");

src/util.cc

@@ -2452,3 +2452,8 @@ bool is_lowercase_alnum_text(const char *text)
     }
     return true;
 }
+
+bool endsWith(const std::string& str, const std::string& suffix)
+{
+    return str.size() >= suffix.size() && 0 == str.compare(str.size()-suffix.size(), suffix.size(), suffix);
+}

src/util.h

@@ -75,6 +75,7 @@ std::string safeString(std::vector<uchar> &target);
 void strprintf(std::string *s, const char* fmt, ...);
 std::string tostrprintf(const char* fmt, ...);
 std::string tostrprintf(const std::string &fmt, ...);
+bool endsWith(const std::string &str, const std::string &suffix);
 
 // Return for example: 2010-03-21
 std::string strdate(struct tm *date);