Process_stub: Make sure strings are \0 terminated

Change-Id: Ic3d431e850cb09627359aae0e0c755f02b4835c0
Reviewed-by: Robert Loehning <robert.loehning@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/libs/utils/process_stub_unix.c

@@ -224,11 +224,12 @@ int main(int argc, char *argv[])
         fseek(envFd, 0, SEEK_END);
         size = ftell(envFd);
         rewind(envFd);
-        envdata = malloc(size);
+        envdata = malloc(size + 1);
         if (fread(envdata, 1, size, envFd) != (size_t)size) {
             perror("Failed to read env file");
             doExit(1);
         }
+        envdata[size] = '\0';
         fclose(envFd);
         for (count = 0, edp = envdata; edp < envdata + size; ++count)
             edp += strlen(edp) + 1;