Fix compiler warnings

src/systemcmds/param/param.c

@@ -231,7 +231,6 @@ do_show_print(void *arg, param_t param)
 		/* start search */
 		const char *ss = search_string;
 		const char *pp = p_name;
-		bool mismatch = false;
 
 		/* XXX this comparison is only ok for trailing wildcards */
 		while (*ss != '\0' && *pp != '\0') {

src/systemcmds/tests/test_mathlib.cpp

@@ -98,6 +98,8 @@ int test_mathlib(int argc, char *argv[])
 		TEST_OP("Vector<3> length squared", v1.length_squared());
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-variable"
+		// Need pragma here intead of moving variable out of TEST_OP and just reference because
+		// TEST_OP measures performance of vector operations.
 		TEST_OP("Vector<3> element read", volatile float a = v1(0));
 		TEST_OP("Vector<3> element read direct", volatile float a = v1.data[0]);
 #pragma GCC diagnostic pop