Remove unreachable return statements

They were needed long ago to avoid gcc warnings, but now all they do
is create coverity warnings.

src/mathed/InsetMathHull.cpp

@@ -2117,9 +2117,6 @@ bool InsetMathHull::getStatus(Cursor & cur, FuncRequest const & cmd,
 	default:
 		return InsetMathGrid::getStatus(cur, cmd, status);
 	}
-
-	// This cannot really happen, but inserted to shut-up gcc
-	return InsetMathGrid::getStatus(cur, cmd, status);
 }
 
 

src/support/Package.cpp

@@ -651,9 +651,6 @@ get_system_support_dir(FileName const & abs_binary,
 				"to the LyX system directory containing the "
 				"file `chkconfig.ltx'."),
 			  from_utf8(searched_dirs_str), from_ascii(LYX_DIR_VER)));
-
-	// Keep the compiler happy.
-	return FileName();
 }