Fixes for coverity warnings.

src/ui.c

@@ -3100,6 +3100,9 @@ get_fpos_of_mouse(mpos)
 
     if (mpos->col > 0)
 	--mpos->col;
+#ifdef FEAT_VIRTUALEDIT
+    mpos->coladd = 0;
+#endif
     return IN_BUFFER;
 }