sr/*.c: Various minor fixes.

* src/autofit/ft-hb.c (_hb_ft_reference_table): Call `FT_UNUSED` after
variable declarations.

* src/gxvalid/gxvjust.c (gxv_just_widthDeltaClusters_validate): Eliminate
unused variable.

* src/gzip/ftgzip.c: Don't call GCC '-Wstrict-prototypes' pragma for C++
compiler.

* src/sfnt/ttcolr.c (ENSURE_READ_BYTES): Remove final semicolon to avoid
compiler warning.

* src/sfnt/ttsvg.c (tt_face_load_svg_doc): Fix signedness warning.

src/autofit/ft-hb.c

@@ -38,12 +38,13 @@
 static hb_blob_t *
 _hb_ft_reference_table (hb_face_t *face, hb_tag_t tag, void *user_data)
 {
-  FT_UNUSED (face);
   FT_Face ft_face = (FT_Face) user_data;
   FT_Byte *buffer;
   FT_ULong  length = 0;
   FT_Error error;
 
+  FT_UNUSED (face);
+
   /* Note: FreeType like HarfBuzz uses the NONE tag for fetching the entire blob */
 
   error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);

src/gxvalid/gxvjust.c

@@ -156,7 +156,6 @@
   {
     FT_Bytes  p         = table;
     FT_Bytes  wdc_end   = table + GXV_JUST_DATA( wdc_offset_max );
-    FT_UInt   i;
 
 
     GXV_NAME_ENTER( "just justDeltaClusters" );
@@ -164,7 +163,7 @@
     if ( limit <= wdc_end )
       FT_INVALID_OFFSET;
 
-    for ( i = 0; p <= wdc_end; i++ )
+    while ( p <= wdc_end )
     {
       gxv_just_wdc_entry_validate( p, limit, gxvalid );
       p += gxvalid->subtable_length;

src/gzip/ftgzip.c

@@ -90,7 +90,9 @@
 
 #if defined( __GNUC__ )
 #pragma GCC diagnostic push
+#ifndef __cplusplus
 #pragma GCC diagnostic ignored "-Wstrict-prototypes"
+#endif
 #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
 #pragma GCC diagnostic ignored "-Wredundant-decls"
 #endif

src/sfnt/ttcolr.c

@@ -61,7 +61,7 @@
 #define ENSURE_READ_BYTES( byte_size )                             \
   if ( p < colr->paints_start_v1                                || \
        p > (FT_Byte*)colr->table + colr->table_size - byte_size )  \
-    return 0;
+    return 0
 
 
   typedef enum  FT_PaintFormat_Internal_

src/sfnt/ttsvg.c

@@ -310,7 +310,8 @@
     if ( error != FT_Err_Ok )
       goto Exit;
 
-    doc_limit = svg->table_size - ( doc_list - (FT_Byte*)svg->table );
+    doc_limit = svg->table_size -
+                  (FT_ULong)( doc_list - (FT_Byte*)svg->table );
     if ( doc_offset > doc_limit              ||
          doc_length > doc_limit - doc_offset )
     {