save as ppm from vips7 with options was broken

it wrote a file with the options still in the name

ChangeLog

@@ -3,6 +3,7 @@
 - vips_sign() was broken
 - png save compression range was wrong
 - more/moreeq was wrong
+- vips7 ppm save with options was broken 
 
 18/6/12 started 7.28.9
 - slightly more memory debugging output

libvips/deprecated/im_vips2ppm.c

@@ -66,5 +66,5 @@ im_vips2ppm( IMAGE *in, const char *filename )
 		}
 	}
 
-	return( vips_ppmsave( in, filename, "ascii", ascii, NULL ) ); 
+	return( vips_ppmsave( in, name, "ascii", ascii, NULL ) ); 
 }