mesa: remove unneeded semicolons

Trivial. Found by Coccinelle.

Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

src/gbm/backends/dri/gbm_dri.c

@@ -440,7 +440,7 @@ dri_screen_create_dri2(struct gbm_dri_device *dri, char *driver_name)
    if (ret) {
       fprintf(stderr, "failed to load driver: %s\n", dri->driver_name);
       return ret;
-   };
+   }
 
    dri->loader_extensions = gbm_dri_screen_extensions;
 

src/mesa/main/dlist.c

@@ -1912,7 +1912,7 @@ save_CallLists(GLsizei num, GLenum type, const GLvoid * lists)
       n[1].i = num;
       n[2].e = type;
       save_pointer(&n[3], lists_copy);
-   };
+   }
 
    /* After this, we don't know what state we're in.  Invalidate all
     * cached information previously gathered:

src/mesa/main/program_resource.c

@@ -200,7 +200,7 @@ _mesa_GetProgramInterfaceiv(GLuint program, GLenum programInterface,
                     "glGetProgramInterfaceiv(%s pname %s)",
                     _mesa_enum_to_string(programInterface),
                     _mesa_enum_to_string(pname));
-      };
+      }
       break;
    case GL_MAX_NUM_COMPATIBLE_SUBROUTINES:
       switch (programInterface) {