fix some unitialized variable use (thanks valgrind)

src/buffer.cc

@@ -214,7 +214,7 @@ void Buffer::update_lines(const Modification& modification)
         std::vector<BufferPos> new_lines;
         // if we inserted at the end of the buffer, we may have created a new
         // line without inserting a '\n'
-        if (endpos == m_content.size() and m_content[pos-1] == '\n')
+        if (endpos == m_content.size() and pos > 0 and m_content[pos-1] == '\n')
             new_lines.push_back(pos);
 
         // every \n inserted that was not the last buffer character created a

src/main.cc

@@ -516,7 +516,9 @@ void exec_commands_in_runtime_file(const CommandParameters& params,
     const std::string& filename = params[0];
     char buffer[2048];
 #if defined(__linux__)
-    readlink("/proc/self/exe", buffer, 2048 - filename.length());
+    ssize_t res = readlink("/proc/self/exe", buffer, 2048 - filename.length());
+    assert(res != -1);
+    buffer[res] = '\0';
 #elif defined(__APPLE__)
     uint32_t bufsize = 2048 - filename.length();
     _NSGetExecutablePath(buffer, &bufsize);