mesa/main: Fix tmp_row memory leak in texstore_rgba_integer.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

src/mesa/main/texstore.c

@@ -1667,8 +1667,10 @@ texstore_rgba_integer(TEXSTORE_PARAMS)
 
    assert(is_array && !normalized);
 
-   if (!is_array)
+   if (!is_array) {
+      free(tmp_row);
       return GL_FALSE;
+   }
 
    invert_swizzle(dst2rgba, rgba2dst);
    compute_component_mapping(GL_RGBA, baseInternalFormat, base2rgba);