Eliminate goto in gcode_M48

Marlin/Marlin_main.cpp

@@ -7038,8 +7038,9 @@ inline void gcode_M42() {
 
     // Move to the first point, deploy, and probe
     const float t = probe_pt(X_probe_location, Y_probe_location, stow_probe_after_each, verbose_level);
-    if (nan_error(t)) goto FAIL;
+    bool probing_good = !isnan(t);
 
+    if (probing_good) {
       randomSeed(millis());
 
       for (uint8_t n = 0; n < n_samples; n++) {
@@ -7113,7 +7114,10 @@ inline void gcode_M42() {
 
         // Probe a single point
         sample_set[n] = probe_pt(X_probe_location, Y_probe_location, stow_probe_after_each, 0);
-      if (nan_error(sample_set[n])) goto FAIL;
+
+        // Break the loop if the probe fails
+        probing_good = !isnan(sample_set[n]);
+        if (!probing_good) break;
 
         /**
          * Get the current mean for the data points we have so far
@@ -7157,12 +7161,13 @@ inline void gcode_M42() {
           }
         }
 
-    } // End of probe loop
+      } // n_samples loop
+    }
 
-    if (STOW_PROBE()) goto FAIL;
+    STOW_PROBE();
 
-    SERIAL_PROTOCOLPGM("Finished!");
-    SERIAL_EOL();
+    if (probing_good) {
+      SERIAL_PROTOCOLLNPGM("Finished!");
 
       if (verbose_level > 0) {
         SERIAL_PROTOCOLPGM("Mean: ");
@@ -7180,8 +7185,7 @@ inline void gcode_M42() {
       SERIAL_PROTOCOL_F(sigma, 6);
       SERIAL_EOL();
       SERIAL_EOL();
-
-    FAIL:
+    }
 
     clean_up_after_endstop_or_probe_move();