nouveau: fix frees in unsupported IR error paths.

This is pointless in that we won't ever hit those paths in real life,
but coverity complains.

Fixes: f014ae3c7c ("nouveau: add support for nir")
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
(cherry picked from commit 93ba356544)

src/gallium/drivers/nouveau/nv50/nv50_program.c

@@ -346,6 +346,7 @@ nv50_program_translate(struct nv50_program *prog, uint16_t chipset,
       break;
    default:
       assert(!"unsupported IR!");
+      free(info);
       return false;
    }
 

src/gallium/drivers/nouveau/nv50/nv50_state.c

@@ -768,6 +768,7 @@ nv50_sp_state_create(struct pipe_context *pipe,
       break;
    default:
       assert(!"unsupported IR!");
+      free(prog);
       return NULL;
    }
 
@@ -864,6 +865,7 @@ nv50_cp_state_create(struct pipe_context *pipe,
       break;
    default:
       assert(!"unsupported IR!");
+      free(prog);
       return NULL;
    }
 

src/gallium/drivers/nouveau/nvc0/nvc0_program.c

@@ -594,6 +594,7 @@ nvc0_program_translate(struct nvc0_program *prog, uint16_t chipset,
       break;
    default:
       assert(!"unsupported IR!");
+      free(info);
       return false;
    }
 

src/gallium/drivers/nouveau/nvc0/nvc0_state.c

@@ -607,6 +607,7 @@ nvc0_sp_state_create(struct pipe_context *pipe,
       break;
    default:
       assert(!"unsupported IR!");
+      free(prog);
       return NULL;
    }
 
@@ -739,6 +740,7 @@ nvc0_cp_state_create(struct pipe_context *pipe,
       break;
    default:
       assert(!"unsupported IR!");
+      free(prog);
       return NULL;
    }