Remove redundant newlines from error messages

These are no longer needed/allowed with the new logging API.

src/bin/pg_basebackup/pg_basebackup.c

@@ -2236,7 +2236,7 @@ main(int argc, char **argv)
 					format = 't';
 				else
 				{
-					pg_log_error("invalid output format \"%s\", must be \"plain\" or \"tar\"\n",
+					pg_log_error("invalid output format \"%s\", must be \"plain\" or \"tar\"",
 								 optarg);
 					exit(1);
 				}
@@ -2308,7 +2308,7 @@ main(int argc, char **argv)
 				compresslevel = atoi(optarg);
 				if (compresslevel < 0 || compresslevel > 9)
 				{
-					pg_log_error("invalid compression level \"%s\"\n", optarg);
+					pg_log_error("invalid compression level \"%s\"", optarg);
 					exit(1);
 				}
 				break;

src/bin/pg_dump/pg_backup_tar.c

@@ -568,7 +568,7 @@ _tarReadRaw(ArchiveHandle *AH, void *buf, size_t len, TAR_MEMBER *th, FILE *fh)
 			}
 		}
 		else
-			fatal("internal error -- neither th nor fh specified in tarReadRaw()\n");
+			fatal("internal error -- neither th nor fh specified in tarReadRaw()");
 	}
 
 	ctx->tarFHpos += res + used;

src/bin/pg_dump/pg_dump.c

@@ -13484,7 +13484,7 @@ dumpCollation(Archive *fout, CollInfo *collinfo)
 		/* to allow dumping pg_catalog; not accepted on input */
 		appendPQExpBufferStr(q, "default");
 	else
-		fatal("unrecognized collation provider: %s\n",
+		fatal("unrecognized collation provider: %s",
 			  collprovider);
 
 	if (strcmp(PQgetvalue(res, 0, i_collisdeterministic), "f") == 0)

src/bin/pg_rewind/pg_rewind.c

@@ -555,7 +555,7 @@ getTimelineHistory(ControlFileData *controlFile, int *nentries)
 		else if (controlFile == &ControlFile_target)
 			histfile = slurpFile(datadir_target, path, NULL);
 		else
-			pg_fatal("invalid control file\n");
+			pg_fatal("invalid control file");
 
 		history = rewind_parseTimeLineHistory(histfile, tli, nentries);
 		pg_free(histfile);