Add wait for child

src/conversion.cpp

@@ -2,6 +2,7 @@
 #include <string>
 #include <sstream>
 #include <unistd.h>
+#include <sys/wait.h>
 #include <libscerror.hpp>
 #include <libscterm.hpp>
 #include "pixels.hpp"
@@ -46,6 +47,9 @@ void convert(const std::string& path) { // try to convert to ppm using ImageMagi
             throw_if_min1(close(pfd[1]));
 
             write_image(std::cout, stdin);
+
+            int exit_status;
+            throw_if_min1(wait(&exit_status));
             break;
     }
 }