Fix data loss when save AOF/RDB with no free space

Previously, the (!fp) would only catch lack of free space
under OS X.  Linux waits to discover it can't write until
it actually writes contents to disk.

(fwrite() returns success even if the underlying file
has no free space to write into.  All the errors
only show up at flush/sync/close time.)

Fixes antirez/redis#1604

src/aof.c

@@ -968,9 +968,9 @@ int rewriteAppendOnlyFile(char *filename) {
     }
 
     /* Make sure data will not remain on the OS's output buffers */
-    fflush(fp);
-    aof_fsync(fileno(fp));
-    fclose(fp);
+    if (fflush(fp) == EOF) goto werr;
+    if (aof_fsync(fileno(fp)) == -1) goto werr;
+    if (fclose(fp) == EOF) goto werr;
 
     /* Use RENAME to make sure the DB file is changed atomically only
      * if the generate DB file is ok. */

src/rdb.c

@@ -690,9 +690,9 @@ int rdbSave(char *filename) {
     rioWrite(&rdb,&cksum,8);
 
     /* Make sure data will not remain on the OS's output buffers */
-    fflush(fp);
-    fsync(fileno(fp));
-    fclose(fp);
+    if (fflush(fp) == EOF) goto werr;
+    if (fsync(fileno(fp)) == -1) goto werr;
+    if (fclose(fp) == EOF) goto werr;
 
     /* Use RENAME to make sure the DB file is changed atomically only
      * if the generate DB file is ok. */