Avoid warnings when building on Windows w/o zlib.

diff --git a/gbfile.c b/gbfile.c
index ef60719a6a6e644ff199371c0dce25fd70ec5ee2..bc5505550d60297094fbf1e7f975d008992857fe 100644 (file)
--- a/gbfile.c
+++ b/gbfile.c
@@ -235,6 +235,7 @@ gbfread(void *buf, const gbsize_t size, const gbsize_t members, gbfile *file)
                return (gbsize_t) result;
 #else
                fatal(NO_ZLIB);
+               return -1;
 #endif
        }
        else {
@@ -314,6 +315,7 @@ gbfwrite(const void *buf, const gbsize_t size, const gbsize_t members, gbfile *f
                result = gzwrite(file->handle.gz, buf, size * members) / size;
 #else
                fatal(NO_ZLIB);
+               return -1;
 #endif
        }
        else {
@@ -338,6 +340,7 @@ gbfflush(gbfile *file)
                return gzflush(file->handle.gz, Z_SYNC_FLUSH);
 #else
                fatal(NO_ZLIB);
+               return -1;
 #endif
        }
        else {
@@ -368,6 +371,7 @@ gbferror(gbfile *file)
                (void)gzerror(file->handle.gz, &errnum);
 #else
                fatal(NO_ZLIB);
+               return -1;
 #endif
        }
        else {
@@ -415,6 +419,7 @@ gbftell(gbfile *file)
                return gztell(file->handle.gz);
 #else
                fatal(NO_ZLIB);
+               return -1;
 #endif
        }
        else {
@@ -430,6 +435,7 @@ gbfeof(gbfile *file)
                return gzeof(file->handle.gz);
 #else
                fatal(NO_ZLIB);
+               return 0;
 #endif
        }
        else {