tools: proftool: Fix potential memory leaks

Dynamic memory, referenced by 'line', is allocated by calling
function 'calloc' and lost when the function terminates with code -1.

Signed-off-by: Maks Mishin <[e-mail]>

tools/proftool.c

···
 		if (!tok) {
 			error("Invalid trace config data on line %d\n",
 			      linenum);
+			free(line);
 			return -1;
 		}
 		if (0 == strcmp(tok, "include-func")) {
···
 		} else {
 			error("Unknown command in trace config data line %d\n",
 			      linenum);
+			free(line);
 			return -1;
 		}
 
···
 		if (!tok) {
 			error("Missing pattern in trace config data line %d\n",
 			      linenum);
+			free(line);
 			return -1;
 		}