Actually return NMEA string with CRLF

src/NMEA_build.cpp

@@ -566,11 +566,12 @@ char *Adafruit_GPS::build(char *nmea, const char *thisSource,
   addChecksum(nmea); // Successful completion
   if (!noCRLF) { // Add Carriage Return and Line Feed to comply with NMEA-183
     size_t len = strlen(nmea);
-    char *newStr =
+    char *nmeaWithCRLF =
         (char *)malloc(len + 3); // +2 for \r\n, +1 for null terminator
-    if (newStr) {
-      strcpy(newStr, nmea);   // Copy original string
-      strcat(newStr, "\r\n"); // Append \r\n
+    if (nmeaWithCRLF) {
+      strcpy(nmeaWithCRLF, nmea);   // Copy original string
+      strcat(nmeaWithCRLF, "\r\n"); // Append \r\n
+      return nmeaWithCRLF;          // return pointer to finished product
     }
   }
   return nmea; // return pointer to finished product