Bug 1394235

This bz is for valid issues reported by covscan for gfs2-utils and not covered by other bug reports. Just the one to begin with:

http://cov01.lab.eng.brq.redhat.com/covscanhub/waiving/15317/54510/#defect_1057213

1. Defect type: CLANG_WARNING
1. cluster-3.0.12.1/gfs2/fsck/main.c:187:18: warning: The left operand of '==' is a garbage value
#         if (sc.sc_total == sdp->blks_total &&
#             ~~~~~~~~~~~ ^
4. cluster-3.0.12.1/gfs2/fsck/main.c:162:16: note: Left side of '&&' is false
#         if (sdp->gfs1 && !sdp->md.statfs->i_di.di_size) {
#                       ^
7. cluster-3.0.12.1/gfs2/fsck/main.c:169:2: note: Taking false branch
#         if (count == sizeof(struct gfs2_statfs_change))
#         ^
10. cluster-3.0.12.1/gfs2/fsck/main.c:177:2: note: Loop condition is false. Execution continues on line 187
#         for (n = osi_first(&sdp->rgtree); n; n = next) {
#         ^
13. cluster-3.0.12.1/gfs2/fsck/main.c:187:18: note: The left operand of '==' is a garbage value
#         if (sc.sc_total == sdp->blks_total &&
#             ~~~~~~~~~~~ ^
#   185|   
#   186|   	/* See if they match */
#   187|-> 	if (sc.sc_total == sdp->blks_total &&
#   188|   	    sc.sc_free == (sdp->blks_total - sdp->blks_alloced) &&
#   189|   	    sc.sc_dinodes == sdp->dinodes_alloced) {

Upstream fixes this just by initialising sc but a better fix would be to handle the earlier error condition from gfs2_readi() such that the function returns instead of leaving sc to be a garbage value.