msm8974-common: gps: Return the correct length of nmea sentence

Return the correct length of nmea sentence in the
function loc_eng_nmea_put_checksum(). The correct
length is length of NMEA string including ‘$’
character alongwith length of checksum.

CRs-Fixed: 1020044
Change-Id: I50d80b9c4492de4664bb3ccb7295b0eb4fee15a9

gps/loc_api/libloc_api_50001/loc_eng_nmea.cpp

@@ -93,8 +93,12 @@ int loc_eng_nmea_put_checksum(char *pNmea, int maxSize)
         length++;
     }
 
+    // length now contains nmea sentence string length not including $ sign.
     int checksumLength = snprintf(pNmea,(maxSize-length-1),"*%02X\r\n", checksum);
-    return (length + checksumLength);
+
+    // total length of nmea sentence is length of nmea sentence inc $ sign plus
+    // length of checksum (+1 is to cover the $ character in the length).
+    return (length + checksumLength + 1);
 }
 
 /*===========================================================================