gsm/cdma: unsigned integers can't be < 0, so remove unnecessary conditions

It fixes compilation with the llvm/clang compiler as well.

src/mm-generic-cdma.c

@@ -591,7 +591,7 @@ crm_done (MMAtSerialPort *port,
     if (p) {
         errno = 0;
         num = strtoul (p, NULL, 10);
-        if (num >= 0 && num <= 4 && (errno == 0)) {
+        if (num <= 4 && (errno == 0)) {
             MM_GENERIC_CDMA_GET_PRIVATE (user_data)->orig_crm = (guint32) num;
             MM_GENERIC_CDMA_GET_PRIVATE (user_data)->cur_crm = (guint32) num;
         }

src/mm-generic-gsm.c

@@ -2892,10 +2892,8 @@ handle_reg_status_response (MMGenericGsm *self,
     if (act != -1)
         mm_generic_gsm_update_access_technology (self, etsi_act_to_mm_act (act));
 
-    if (status >= 0) {
-        /* Update cached registration status */
-        reg_status_updated (self, cgreg_to_reg_type (cgreg), status, NULL);
-    }
+    /* Update cached registration status */
+    reg_status_updated (self, cgreg_to_reg_type (cgreg), status, NULL);
 
     return TRUE;
 }