[jitter] Bug in jit.rota inside jit.expr

Summary:
"€ error: jit.expr: null matrix in jit_expr_treecalc" error message when
theta < 0, when jit.rota is used as a functor from within [jit.expr].

Steps to Reproduce:
-open the patch
-read a jpg
-bang the jit.qt.movie
-try a positive value for theta, that works
-try a negative value, see the error message and the incorrect result

Expected Results:
-same result as with jit.rota

Actual Results:
-no rotation

Regression:
tested on PB G4 OS X 10.4.10, MaxMSP 4.6.3, Jitter 1.6.3

Notes
Same bug with float32 matrices.
Jean-François.

Patch:
#P button 134 95 15 0;
#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P newex 343 207 29 196617 t b f;
#P window linecount 2;
#P comment 449 132 170 196617 message "null matrix in jit_expr_treecalc" in
Max window;
#P window linecount 1;
#P comment 449 119 100 196617 theta <0 \, problem;
#P comment 449 81 100 196617 theta >0 \, no problem;
#P message 390 123 30 196617 -0.5;
#P window setfont "Sans Serif" 18.;
#P comment 426 118 21 196626 3;
#P user panel 377 111 251 53;
#X brgb 255 255 255;
#X frgb 154 0 232;
#X border 3;
#X rounded 0;
#X shadow 0;
#X done;
#P window setfont "Sans Serif" 9.;
#P message 388 82 31 196617 1.12;
#P window setfont "Sans Serif" 18.;
#P comment 426 76 21 196626 2;
#P user panel 377 69 180 39;
#X brgb 255 255 255;
#X frgb 154 0 232;
#X border 3;
#X rounded 0;
#X shadow 0;
#X done;
#P window setfont "Sans Serif" 9.;
#P message 648 291 48 196617 theta \$1;
#P comment 349 169 37 196617 theta;
#P newex 270 313 69 196617 prepend expr;
#P message 674 122 14 196617 2;
#P message 640 122 14 196617 0;
#P newex 640 93 48 196617 loadbang;
#P user jit.pwindow 643 432 202 152 0 1 0 0 1 0;
#P user jit.pwindow 269 432 202 152 0 1 0 0 1 0;
#P window linecount 5;
#P message 357 362 97 196617 expr "jit.rota(in[0]\\\, @theta -0.500000\\\,
@interp 0\\\, @boundmode 2)";
#P window linecount 1;
#P newex 134 177 27 196617 t l b;
#P message 907 294 71 196617 boundmode \$1;
#P message 839 294 50 196617 interp \$1;
#P toggle 478 179 15 0;
#P message 153 95 74 196617 read chilis.jpg;
#P newex 134 123 105 196617 jit.qt.movie 600 400;
#P newex 644 355 43 196617 jit.rota;
#P newex 357 343 62 196617 prepend set;
#P newex 270 355 45 196617 jit.expr;
#P number 503 179 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P flonum 343 182 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P newex 270 281 386 196617 sprintf symout jit.rota(in[0]\\\\\\\, @theta
%f\\\\\\\, @interp %i\\\\\\\, @boundmode %i);
#P window setfont "Sans Serif" 18.;
#P comment 236 88 21 196626 1;
#P user panel 127 81 145 41;
#X brgb 255 255 255;
#X frgb 154 0 232;
#X border 3;
#X rounded 0;
#X shadow 0;
#X done;
#P connect 4 0 2 2;
#P connect 4 0 12 0;
#P connect 10 0 2 1;
#P connect 10 0 11 0;
#P connect 17 0 18 0;
#P connect 17 0 19 0;
#P connect 32 1 2 0;
#P connect 32 1 22 0;
#P connect 3 0 32 0;
#P connect 3 0 22 0;
#P connect 7 0 16 0;
#P connect 11 0 7 0;
#P connect 12 0 7 0;
#P connect 22 0 7 0;
#P fasten 13 0 5 0 139 354 275 354;
#P lcolor 7;
#P fasten 13 0 7 0 139 337 649 337;
#P lcolor 7;
#P fasten 19 0 4 0 679 177 508 177;
#P fasten 18 0 10 0 645 174 483 174;
#P connect 6 0 14 0;
#P connect 20 0 5 0;
#P connect 20 0 6 0;
#P connect 28 0 3 0;
#P connect 25 0 3 0;
#P connect 5 0 15 0;
#P connect 2 0 20 0;
#P fasten 13 1 2 0 156 266 275 266;
#P connect 8 0 13 0;
#P fasten 9 0 8 0 158 115 139 115;
#P connect 33 0 8 0;
#P fasten 32 0 33 0 348 236 337 236 337 73 139 73;
#P window clipboard copycount 34;