gradient.c Removed implicit-fallthrough warnings
This patch adds the comments to remove the warnings.
gradient.c: In function ‘renderGradientWidth’:
gradient.c:162:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
*ptr++ = b;
~~~~~~~^~~
gradient.c:163:2: note: here
case 2:
^~~~
gradient.c:166:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
*ptr++ = b;
~~~~~~~^~~
gradient.c:167:2: note: here
case 1:
^~~~
Signed-off-by: Rodolfo García Peñas (kix) <kix@kix.es>