butc: fix format overflow warning

Recent versions of gcc generate an overflow warning in the butc DUMPNAME macro
when copying values into the finishedMsg1 buffer. Increase the size of the
destination buffer to avoid a possible buffer overflow.

    dump.c:88:24: error: ‘%s’ directive writing up to 63 bytes into
    a region of size 50 [-Werror=format-overflow=]
          sprintf(dumpname, "%s (DumpId %u)", name, dbDumpId);
                            ^
    dump.c:1294:5: note: in expansion of macro ‘DUMPNAME’
         DUMPNAME(finishedMsg1, nodePtr->dumpSetName, dparams.databaseDumpId);
         ^~~~~~~~
    dump.c:88:6: note: ‘sprintf’ output between 12 and 84 bytes into
    a destination of size 50
          sprintf(dumpname, "%s (DumpId %u)", name, dbDumpId);
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    dump.c:1294:5: note: in expansion of macro ‘DUMPNAME’
         DUMPNAME(finishedMsg1, nodePtr->dumpSetName, dparams.databaseDumpId);
         ^~~~~~~~

Change-Id: Iadf87a308ab6c500a8407a269bc0fd443ff0c735
Reviewed-on: https://gerrit.openafs.org/12916
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>

src/butc/dump.c

@@ -1116,7 +1116,7 @@ Dumper(void *param)
     int nodumpvolumes = 0;
     char strlevel[5];
     char msg[20];
-    char finishedMsg1[50];
+    char finishedMsg1[128];
     char finishedMsg2[50];
     time_t startTime = 0;
     time_t endTime = 0;