systemlib printload naming consistency

src/modules/systemlib/CMakeLists.txt

@@ -47,7 +47,7 @@ set(SRCS
 
 if(${OS} STREQUAL "nuttx")
 	list(APPEND SRCS
-		printload.c
+		print_load_nuttx.c
 		)
 else()
 	list(APPEND SRCS

src/modules/systemlib/printload.c → src/modules/systemlib/print_load_nuttx.c

@@ -380,4 +380,3 @@ void print_load(uint64_t t, int fd, struct print_load_s *print_state)
 
 	print_load_buffer(t, data.buffer, sizeof(data.buffer), print_load_callback, &data, print_state);
 }
-