Correction of HAL for CC2420 on concerned boards

boards/telosb/driver_cc2420.c

@@ -96,7 +96,7 @@ int cc2420_get_gio1(void)
     return CC2420_GIO1;
 }
 
-int cc2420_get_fifop(void)
+uint8_t cc2420_get_fifop(void)
 {
     return CC2420_FIFOP;
 }

boards/wsn430-v1_4/driver_cc2420.c

@@ -104,6 +104,11 @@ uint8_t cc2420_get_sfd(void)
     return CC2420_SFD;
 }
 
+uint8_t cc2420_get_fifop(void)
+{
+    return CC2420_GDO2;
+}
+
 uint8_t cc2420_get_cca(void)
 {
     uint8_t status;

boards/z1/driver_cc2420.c

@@ -111,7 +111,7 @@ int cc2420_get_gio1(void)
     return CC2420_GIO1;
 }
 
-int cc2420_get_fifop(void)
+uint8_t cc2420_get_fifop(void)
 {
     return CC2420_FIFOP;
 }