evmctl: fix memory leak in get_password

The variable "password" is not freed nor returned in case get_password()
succeeds. Return it instead of the intermediary variable "pwd". Issue found
by Coverity scan tool.

src/evmctl.c:2565: leaked_storage: Variable "password" going out of scope
    leaks the storage it points to.

Signed-off-by: Bruno Meneguele <bmeneg@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

src/evmctl.c

@@ -2629,7 +2629,12 @@ static char *get_password(void)
 		return NULL;
 	}
 
-	return pwd;
+	if (pwd == NULL) {
+		free(password);
+		return NULL;
+	}
+
+	return password;
 }
 
 int main(int argc, char *argv[])